Metamorphose

Metamorphose.org
A Catalog of Transformations, Plus Reviews and Alerts

MSG Board
52		Body Swap in Video G
1		Are there any good F
12		"Memory Run" (Synaps
48		Infinite Worlds Tran
2		Bro and sis body swa
1		I need help...
1859		female body swap and

Just Genital Transformations
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From: guest (The Ed) , 4 months, post #761

New one - Haven't read it yet
But looks good or at least apropos
Suddenly Female by TheSpiralledEye
https://www.tgstorytime.com/viewstory.php?sid=8533&ageconsent=ok&warning=3

From: guest (Horselessnorsemen) , 4 months, post #762

Trying cyoc again

https://www.cyoc.net/interactives/chapter_245624.html

From: guest , 4 months, post #763

Is anyone able to get the one from post 757 to load? I have tried a few times since it was posted but it won’t work for me. Can anyone provide an alternate link?

From: guest , 4 months, post #764

exhentai.org is designed not to load unless you're logged in. Try this website https://e-hentai.org/g/3385291/2175d3527a/

From: guest (NoOne) , 4 months, post #765

Tried using chatGPT to create the story I wanted to read. It's close but there are a lot restrictions when it came to the naughtier stuff. Link valid for 7 days. I'll continue it on my own, but I may or may not share it, depending on the reception.

https://limewire.com/d/cFhaR#MZQLDyThfj

From: guest (Noname) , 4 months, post #766

One of the best I have found is https://poe.com/Pen_of_Power since you can write almost anything with the pen you can do so much with it.

One negative with it is it will sometimes use the pen when you did not want it to.

Mind you I did not make this I just found it works well

From: guest , 3 months, post #767

I saw the rules on the Internet and modified them with AI. It's just an idea. You can discuss it.

1. Core Physiology & Reproduction
Anatomical Docking:

The male urethra is not outside the body, but is located at the top of the vagina, near the base of the clitoris, and is protected by a mucous membrane.

The end of the female penis (glans) has evolved a special structure, whose urethra can not only urinate, but also slightly evert and expand, forming a funnel-shaped structure similar to a "receiving port".

During sexual intercourse, when the female penis completely enters the male vagina and reaches the top, the muscles of both parties will naturally contract in an excited state, so that the "receiving port" of the female penis can be accurately docked with the male "sperm discharge port". This process can be called "reproductive docking".

The Process of Fertilization:

Insertion and stimulation: The female inserts the penis into the male vagina, and both parties get pleasure through friction. The male clitoris and vaginal wall, as well as the female penis, are full of nerves, and the feelings are similar to sexual behavior in our world.

Orgasm and ejaculation: When a man reaches orgasm, his testicles will eject semen through the vas deferens and out of the urethra in the vagina. Since the "coitus" has been completed, the semen will be directly ejected into the "receiving port" of the urethra of the female penis.

Insemination-Climax: After a woman receives the chemical signals and physical stimulation of semen, it will trigger a special and deeper "insemination orgasm". This orgasm will trigger the rhythmic contraction of the uterus and fallopian tubes, generating an inward suction force, which will guide the semen from the deep of her penis urethra, through the internal tubes, all the way to the uterus, and finally reach the fallopian tube to combine with the egg.

Implantation and pregnancy: After the fertilized egg is formed in the fallopian tube, it will move to the uterus to implant. The subsequent pregnancy, fetal development, childbirth and other processes are completely carried out in the female body, which is consistent with the pregnancy of women in our world.

2. Menstruation & Sperm Metabolism
Female Menstruation: It is completely unchanged. If the egg released that month is not fertilized, the female endometrium will peel off and mix with blood and be discharged from the body through her penis urethra. This will be a regular and visible physiological phenomenon.

Male Sperm Metabolism: Men do not have a uterus, so they do not have menstruation. But they continue to produce sperm. A large part of expired or excess sperm will be naturally decomposed and absorbed by the body, and a small part will be unconsciously discharged from the body in the form of **"nocturnal emission" or mixed with a small amount of semen when urinating. This is a very small amount of irregular physiological phenomenon that does not cause discomfort, so there is no "monthly sperm false"**.

3. Pregnancy & Lactation
Pregnancy & Birth: As mentioned above, the physiological responsibility of pregnancy and childbirth is entirely borne by women. They will experience morning sickness, bulge in the abdomen, and eventually give birth to babies through the birth canal (a suitable method of delivery needs to be evolved, which may be the expansion of the perineum tissue at the connection between the base of the penis and the body to form a temporary birth canal) or caesarean section.

Lactation: Since the hormones of pregnancy (prolactin, progesterone, etc.) are completely secreted in the female body, only women will secrete milk after giving birth. They have breasts and mammary glands and are responsible for breastfeeding their offspring. This is exactly the same as our world.

4. Masturbation & Sexual Pleasure
Male masturbation: Get pleasure by stimulating your clitoris, labia and vagina. During orgasm, semen will be ejected from the urethra in the vagina, flow into the vagina, and then naturally flow out of the body.

Female masturbation: Get pleasure by stimulating your penis and can reach orgasm. But this orgasm is a simple muscle contraction pleasure, lacking the deep satisfaction from the inside out after receiving semen like the "conception orgasm". This also explains why they still desire to have sex with male partners in pursuit of a more complete physiological experience.

Details of the Birth Canal
In this reversed physiological world, the female penis is not only an organ for sexual intercourse and fertilization, but also needs to assume the function of the birth canal during childbirth. The following is a detailed supplement to the structure of the birth canal and the mechanism of childbirth:

Anatomy of the Birth Canal
Special design of the penis root and perineum tissue:
The female penis root and the body connection (i.e., the perineum area) have evolved a structure composed of highly elastic and expandable connective tissue, called the "Birthing Annulus". This annulus is composed of smooth muscle, elastic fiber and nerve-rich mucosa. It is usually in a contracted state and is closely connected to the urethra and reproductive tract of the penis, but it can expand significantly during childbirth to form a temporary birth canal.
Path of the birth canal:
The female reproductive tract (from the uterus to the penis) contains a special "uterus-penile channel" (Utero-Penile Tract). This channel is usually responsible for transporting semen from the "receiving port" of the penis urethra to the uterus, but in the late pregnancy, it will become more flexible under the influence of hormones (such as oxytocin and relaxin) to prepare for delivery. During delivery, the fetus will pass through this channel from the uterus, through the birth ring at the base of the penis, and finally leave the mother's body.
Adaptive structure of the penis:
When the female penis is not in labor, it mainly serves as a sexual organ and a channel for the discharge of urine/menstruation. Its internal urethra will become looser due to the action of hormones during delivery, and the mucosa and muscle layer of the urethral wall can temporarily expand to accommodate the passage of the fetus. The external tissue of the penis (especially the glans) will be pushed to one side or turned outward during delivery to avoid obstructing the passage of the fetus.
The Birthing Process
Phase 1: Uterine contractions and preparation of the birth canal
When labor begins, the woman's uterus begins to contract strongly (uterine contractions), driven by oxytocin. At the same time, the smooth muscle and elastic fibers of the birth cuff begin to relax under the action of relaxin, expanding to a diameter of 10-12 cm, enough for the fetal head to pass through. The urethra/genital duct in the penis will also expand synchronously to form a continuous, temporary birth canal.
Stage 2: Fetal passage
The fetus enters the uterine-penile channel from the uterus and moves down the channel. The birth cuff, as the final exit, will be fully opened under the push of uterine contractions. The external tissue of the penis (including the glans) will turn outward or move sideways due to pressure to allow the fetus to pass smoothly. This process may be accompanied by intense pain, but the female perineal tissue has a low risk of tearing due to its high elasticity.
Stage 3: Placental expulsion
After the fetus is born, the uterus continues to contract slightly to expel the placenta and membranous membranes. This process is also completed through the uterine-penile channel and birth cuff, similar to the discharge method of menstruation, but with a larger flow rate.
Evolutionary Adaptations and Protective Mechanisms
Elasticity and healing of perineal tissues:
The connective tissue of the birth cuff is rich in collagen and elastin, which allows it to quickly return to its original shape after delivery. After delivery, hormones promote tissue repair, ensuring that the perineum and base of the penis return to normal function within a few weeks, reducing the risk of infection or injury.
Lubrication and protection:
During delivery, the mucous membranes in the perineum and penis secrete a large amount of mucus to reduce friction and protect the fetus and maternal tissues. This mucus is secreted by special glands located near the birth cuff, similar to Bartholin’s glands in our world.
Neural regulation:
The ducts in the birth cuff and penis are rich in nerve endings that can accurately sense the movement of the fetus and coordinate muscle contractions. At the same time, endorphins released in the brain reduce pain during delivery and improve women’s tolerance.
Flexibility in Delivery Methods
Natural delivery:
As mentioned above, natural delivery through the uterine-penile channel and birth cuff is the most common method. Women may squat or lie on their side to use gravity to assist the passage of the fetus.
Caesarean section:
If natural delivery is blocked by a large fetus, a narrow birth canal, or other complications, a cesarean section is still an option. The surgery is performed through an incision in the abdomen directly into the uterus, bypassing the penis and the birth cuff. Recovery after the surgery is similar to a cesarean section in our world.
Underwater birth:
Due to the high elasticity of the birth cuff and the canal inside the penis, underwater birth may be a popular option. The water pressure can reduce pressure on the perineal tissues, while the warm water relaxes the muscles and relieves labor pain.
Postpartum recovery
Recovery of penis function:
After delivery, the urethra and external tissues of the penis may be temporarily swollen or sensitive, but normal sexual and urinary function usually returns within 2-6 weeks. The elastic tissue of the birth cuff shrinks back to its original shape, ensuring that subsequent pregnancies can still proceed normally.
Hormonal regulation:
After delivery, prolactin and progesterone levels rise, promoting breast milk secretion while suppressing ovulation, reducing the possibility of another pregnancy in the short term. This is consistent with the female physiology of our world.
Psychological and social support:
Because childbirth has a great physical and psychological impact on women, the culture of this world may place special emphasis on postpartum care, including partner support, medical intervention and community assistance to help women recover.
Coherence with other parts
Connection with the fertilization process:
The uterine-penile channel in the penis is responsible for transporting semen from the "receiving port" to the uterus during fertilization, and works in the opposite direction during childbirth, pushing the fetus from the uterus to the outside of the body. The versatility of this channel is key to evolution and ensures the high integration of the female reproductive system.
Connection with lactation:
After childbirth, women's breasts and mammary glands begin to secrete milk, which works in conjunction with the expansion of the birthing ring and the contraction of the uterus, showing the coordinated role of the hormonal system in the entire reproductive cycle.
Difference from masturbation:
The penis only provides pleasure during masturbation, without activating the expansion function of the birthing ring or the uterine-penile channel, which ensures that the special physiological mechanism of childbirth will not be mistakenly triggered during daily sexual behavior.

From: guest , 3 months, post #768

gonna be honest, not a fan of the uptick of AI

From: guest (Guest) , 3 months, post #769

Several I found in infiniteworlds.app. There are still several others that I didn't include in here because it transform the user into Futa and probably didn't exactly fit here.

Role Reversal Reproduction
https://infiniteworlds.app/#Gjtzuj

Don't touch it
https://infiniteworlds.app/#NViVhj

Genital Exchange Program
https://infiniteworlds.app/#LaMAaz

From: guest , 3 months, post #770

Can we chill with these ai credit system posts? You dont get anywhere with these stories unless you pay and if you come back the next day you get 2 more choices. The story doesn't really progress if you write in your own so you have to choose one of theirs and they are made to stall so you dont get any new story. And the only person benefiting is the one that made it bc the more people click on the link the more credits the author gets.

From: guest (Anon) , 3 months, post #771

Personally I didn't mind thought, it's like the paid version of this site https://perchance.org/ai-story-generator

I check the infiniteworlds site, I think it's quite generous. They give you 1,000 free credits without needing to login. If you ran out, you could clear your cookies and enter again for another 1,000 free credits.

I tried the first one "Role Reversal Reproduction" and it jump into sex at early turn D:
The story did progress, albeit slow. Thankfully after a few turns usually there's one option to skip one or two weeks later.

From: guest (Krack) , 2 months, post #772

that perchance one is pretty nice, especially cuz it's free. thanks.

From: guest (Anon) , 2 months, post #773

Perchance is quite decent for a free site, the downside that I know so far:
1. It can only write in third person view.
2. The writing could get repetitive.
3. Long story or complicated one will make the AI hallucinating.
4. The default three different ideas on what should happen next is quite bad, it's better to just write it manually about what should happen next.

Anyway, here's a premade story I create. You could copy and paste in perchance, and click generate for the story.

---

Create a story with sexual explicit content.

The Main Character: Sakurajima "Mai" a female Japanese born in America, she is 25 year old with slender body and silky hair. She is currently working as a marketing supervisor for a famous F&B company. Mai is smart, beauty, and outgoing. She's secretly having an affair with her Manager, Mark.

Supporting Characters:
1. "Mark" Anthony, he's American male age 30 year old working as Marketing Manager of F&B company. He's quite handsome and easygoing. He's already married to a woman named Sandra, but he's having an affair with Mai and deeply in love with her.
2. "Rachel" Hayes, Mai colleagues also work in the Marketing. She's highly attractive, bubbly, and have natural flirty demeanor. She doesn't mind to have casual sex with other men's. Rachel and Mai is friendly to each others

Story Premise: Currently Mai and Mark is having business trip together to meet their clients in Canada. They also use this trip to commit affair and adultery. However one night, after they have hot steamy sex, there were mysterious incident where Mark Penis become stuck inside Mai Vagina. When they try to forcefully detach it, somehow their genitals magically become swapped with each other. Mai now have Mark Penis, while Mark now have Mai Vagina!

---

From: guest (Horseless Norsemen) , 2 months, post #774

Here you all go: https://fictionmania.tv/stories/readtextstory.html?storyID=175565216124542437 wife turns her husband into a pussy boy. Both enjoy it.

From: guest (Krack) , 2 months, post #775

That one's REALLY good, nice to have something non-AI for the first time in a while.

From: guest (The Ed) , 2 months, post #776

Horseless dropped another one... and Thank you Mr. Norseman
Chronivac: Natural Transition
https://www.fictionmania.tv/stories/readtextstory.html?storyID=1756062757108227001

From: guest (Horseless Norsemen) , 2 months, post #777

Here's a summary of my stories on the theme:

Story - Link - About It

From: guest , 2 months, post #778

https://tgstorytime.com/viewstory.php?sid=8684

From: guest (Ed) , 1 months, post #779

Found another one

Another False Alarm
https://www.fictionmania.tv/stories/readtextstory.html?storyID=1737270482337027983

From: guest , 1 months, post #780

"Homology" Worldview Core Ruleset (Expanded Detailed Version v2.0)
Preface
Chapter 1: Core Principles
1.1 The Principle of Homology
Rule: In this worldview, the external reproductive systems of both males and females develop from the same embryonic structure—the vulva interna. This unshakable primary gender foundation determines the clear anatomical correspondence between the two sexes and fundamentally shapes societal concepts of gender.
Precise Definition: The Core Meaning of the "Principle of Reproductive Homology"
In the context of the "Vulva Universe," the "Principle of Reproductive Homology" should be precisely defined as follows:
"The core components of the external reproductive system of both males and females originate from the same embryonic initial structure—the vulva interna—which develops under the guidance of sex hormones. Therefore, the reproductive organs of the two sexes have a one-to-one correspondence in the "structural table," but in adulthood, their macromorphology, physiology, and evolutionary adaptations exhibit significant differences due to sexual dimorphism."

This definition clarifies several key points:

Level of Homology: Homology manifests at the level of embryonic origin. Just as in the real world, the male penis and female clitoris, the male scrotum and female labia majora, all originate from the same embryonic tissue. This worldview further reinforces this concept, suggesting that the entire external genitalia derives from a unified "vulva" structure.

Homology: Homology primarily manifests itself in structural correspondence, not morphological similarity. The document mentions that both men and women possess a "vaginal genital cavity," a "clitoris," "labia majora and minora," and "vestibular glands." It's like the same blueprint (embryonic structure) being constructed by different construction teams (hormones and genetic instructions) with vastly different functions.

Source of Difference: Significant functional differences (such as male dynamic erections vs. female birth canal) are attributed to **"1.2 Sexual Dimorphism Principle" and "1.3 Evolutionary Adaptation Principle." This means that despite a common origin, these homologous organs have evolved in distinct specialized ways over the course of evolution to accommodate different reproductive strategies (ejaculation vs. pregnancy and childbirth).
1.2 The Principle of Sexual Dimorphism
Rule: Despite a homologous reproductive system, human sexual dimorphism remains significant. Influenced by hormones, evolutionary pressures, and reproductive strategies, men and women exhibit clear and systematic differences in anatomy, physiology, and secondary sexual characteristics. This dimorphism forms the physiological basis for the biological and even traditional social role differences between men and women. 1.3 The Principle of Evolutionary Adaptation
Rule: All sex differences in this worldview, including dynamic erectile structures, are considered the result of evolutionary adaptations to enhance reproductive efficiency, conserve energy expenditure, and promote long-term partnerships under specific environmental pressures. Every physiological feature has its own evolutionary logic.
Chapter 2: Anatomy and Physiology
2.1 Reproductive System
2.1.1 Common Structures: Both male and female vulvas possess corresponding core structures, including the genital cavity (the "vagina" in females and the "erectile sheath" in males), the clitoris, the labia majora and minora, and the vestibular glands. These structures are functionally equivalent, but differ in morphology and sensitivity between the sexes. 2.1.2 Detailed Description of Structural Differences:
Male:
Location and Morphology: The vulva is located in the lower pelvis, near the pubic symphysis. The genital cavity is deeper (average 8-10 cm), with a thicker muscular wall and more abundant vascular tissue.
Secretion: The secretion is thinner, with lubricating fluid and a small amount of protein-rich precum produced during sexual arousal.
Female:
Location and Morphology: The vulva is located in the lower pelvis, near the perineum. The genital cavity is shallower (average 6-8 cm), with a softer mucosal wall and a thinner but highly elastic muscular wall.
Functional Adaptation: This structure facilitates the reception of semen, serves as a channel for menstrual discharge, and ultimately becomes the birth canal for delivery. Discharge: Discharge is thicker, primarily a clear or milky lubricating fluid, and is discharged as menstrual blood during the menstrual cycle.
2.1.3 Detailed Description of Clitoral Differences:
The male clitoris is slightly larger (average 2-3 cm) and has a more widespread distribution of nerve endings, not just at the tip. This results in a more concentrated sensation of sexual pleasure (orgasm is typically centered at the moment of ejaculation). Even mild stimulation can trigger intense, pervasive pleasure, potentially even triggering slight rhythmic contractions of the vaginal genital cavity. Therefore, men are more likely to orgasm.
The female clitoris is smaller (average 1-2 cm), but has a much higher density of nerve endings, concentrated at the tip. This results in a more localized and sharpened sexual response, making it suitable for precise, focused stimulation and capable of producing extremely intense, localized orgasms. Chapter 2: Anatomy and Physiology (Revised)
2.2 Principles of the Male Erection Mechanism
The core principle of this chapter has been revised from "partner-triggered" to "neural threshold-triggered," meaning that erection formation no longer relies on complex signals from a real partner.
2.2.1 Law of Dynamic Formation:
The male "erectile structure" is not a permanent external organ. Instead, it is a temporary structure that dynamically forms when sexual arousal reaches a specific neural threshold. The "erectile tissue zone" within the vaginal genital cavity becomes heavily engorged with blood, hardens, and expands outward.
Physiological Process and Speed: This process is directed by the nervous system. When stimulated effectively, the parasympathetic nervous system releases nitric oxide (NO), relaxing the smooth muscles within the penis cavity and rapidly dilating blood vessels, allowing a large influx of blood into the erectile tissue zone. Under ideal conditions, the entire process from effective stimulation to complete erection is extremely rapid, typically taking only 1 to 2 seconds. After orgasm, the sympathetic nervous system activates, blood flow decreases, and the structure gradually retracts into the penis cavity.
2.2.2 Law of Neurostimulation:
Rule: The complete formation of the erectile structure depends on whether the individual's nervous system's level of sexual arousal reaches a critical threshold. Any form of intense sexual stimulation, whether from a partner, self-stimulation, visual, auditory, or pure fantasy, can trigger the "dynamic formation law" as long as it can raise arousal to this threshold.

Sources of Stimulation:

Physical stimulation: Direct physical contact with the clitoris, genital lining, or other erogenous zones, whether from a partner or self-stimulation (masturbation), is the most direct and effective trigger.

Psychological and Sensory Stimulation: Viewing pornographic images, reading erotic literature, sexual fantasies, auditory stimulation, etc., can all increase arousal levels independently or in combination. For sensitive individuals, intense fantasies alone may reach the erection threshold.
Partner Interaction: While chemical signals (pheromones), emotional connection, and physical interaction from a partner are no longer essential, they remain the most effective catalysts, significantly lowering the threshold for erection and significantly increasing the hardness and duration of erections.

2.2.3 Masturbation Methods and Limitations: Principle: Based on the "nerve triggering law," male masturbation can trigger the "dynamic formation law," thereby forming a complete erection structure. This method of masturbation therefore serves a dual purpose: to pursue pleasure and achieve an erection.

Main Methods:

Pre-arousal: Through external stimulation of the clitoris and the entrance to the genital cavity, intense whole-body pleasure and sexual arousal are induced.
Erection Triggering: Continuous stimulation, or combined with sexual fantasies or visual stimulation (such as viewing pornography), brings sexual arousal to a threshold, triggering the dynamic extension of erectile structures from the vagina.

Orgasm: Direct stimulation of the established erectile structures until orgasm is achieved.

Orgasm Form: Orgasm is characterized by intense whole-body pleasure, rhythmic contractions of the genital cavity, and the release of semen. The physiological consequences of this process are highly similar to orgasm during partnered intercourse.

2.2.4 Core Concept Revision: Sexual Arousal and Full Erection:

Rule: "Sexual arousal" and "full erection" are closely linked and continuous processes.
Sexual arousal refers to the series of physiological responses that occur in the body after sexual stimulation, such as clitoral engorgement, lubricant secretion, and increased sensitivity of the genital lining.

Full erection is the physiological manifestation of peak sexual arousal, the result of a qualitative shift from quantitative change. There is no longer an insurmountable gap between the two, but rather a difference in the degree of arousal. 2.3 Principles of Cyclic Sexual Physiology
2.3.1 Menstruation: Defined as the proliferation and shedding of the endometrium in response to cyclical changes in estrogen and progesterone levels, it is a true reproductive cycle phenomenon directly linked to ovulation. It is accompanied by significant symptoms such as abdominal pain and mood swings. 2.4 Other Physiological Differences
2.4.1 Skin and Hair:
Men: Thicker skin with higher collagen content, larger pores, and more oil secretion. Due to the influence of testosterone, facial and body hair grows thicker.
Women: Thinner, more delicate and smooth skin with smaller pores. Hair is sparser and softer.
2.4.2 Body Curves and Frame:
Men: Narrower pelvis, wider shoulders, and body fat tends to accumulate in the abdomen and upper torso, creating an "inverted triangle" body shape.
Women: Wider pelvis (to accommodate childbirth), narrower waist, and body fat tends to accumulate in the hips, thighs, and chest, creating an "hourglass" or "pear" body shape.
2.4.3 Voice and Larynx:
Men: Longer and thicker vocal cords, more prominent Adam's apple (thyroid cartilage), resulting in a deeper voice (average 100-150 Hz).
Women: Shorter and thinner vocal cords, less prominent Adam's apple, and higher voice frequency (average 180-250 Hz).
Chapter 3: Social, Cultural, and Ethical Norms
3.1 Gender Structure Norms
Norms: Reproductive homology, but distinct physical differences between men and women. Title: From Biology to Sociology: How Male Infertility is Constructed as a Structural Advantage in Patriarchy
Your question—"Why does 'male infertility' confer advantages, thereby solidifying patriarchy?"—gets to the heart of research on patriarchal societies. The answer lies not in biological determinism, but in how society constructs a whole system of social, economic, and cultural power imbalances around the biological difference of fertility.
Simply put, men do not gain an advantage simply by remaining childless. Rather, social structures assign a higher value to the qualities associated with childlessness (continuity of time, bodily autonomy, and risk transfer), and frame it as a ticket to the core realms of power.

The following are the detailed mechanisms of this transformation:

1. Continuity of time and energy: Capital accumulation in the public sphere

This is the most direct and core mechanism. The female menstrual cycle: Pregnancy, childbirth, breastfeeding, and postpartum recovery are lengthy, energy- and time-consuming physiological processes. In the absence of modern medical care and childcare support, this process occupied most of a woman's adult life, giving her life trajectory a cyclical and discontinuous character.

The male linear trajectory: In contrast, men do not face the inevitable physiological interruptions associated with childbirth. Their time and energy can be invested linearly and uninterruptedly in activities within the public sphere, such as:

Accumulating skills and knowledge: Engaging in crafts that require years of practice (such as hunting, warfare, and craftsmanship).

Managing politics and power: Participating in tribal councils, political alliances, lawmaking, and other activities that require long-term commitment. Wealth Creation and Inheritance: Conducting trade, managing land, and establishing a business.

Advantage Formation: In a competitive society, the continuity of time itself is a tremendous asset. The rules of the patriarchal game are precisely tailored for this "linear time investor." They reward those who can consistently accumulate prestige, wealth, and power in the public sphere. Consequently, men's "barrenness" is socially transformed into a prerequisite for success in the public sphere, while women, due to their reproductive roles, are systematically excluded.

2. The Public/Private Divide and the Devaluation of Values
Based on the aforementioned differences in time allocation, society further constructs the public/private binary division of "men work outside, women work inside." The Public Sphere: Linked to men, encompassing politics, economics, culture, and law. This sphere is defined as "valuable," creative, and determining the direction of society.
The Private Sphere: Linked to women and childbearing, encompassing housework, childcare, and emotional labor. This sphere is defined as "natural," non-productive, and auxiliary, and the value of labor there is severely underestimated or even ignored.
The Consolidation of Advantage: Power, wealth, and social status are almost entirely generated and distributed in the public sphere. Men, through their childlessness, gain privileged access to the public sphere and, in turn, become gatekeepers of this realm. They set the rules, define what constitutes "important" work, and exclude women's childbearing and domestic labor from the value calculation system. This creates a perfect closed loop: men dominate the public sphere because of their childlessness, and their dominance of the public sphere allows them to define "childbearing" as a low-value private matter.
3. Bodily Autonomy and Risk Transfer
Instrumentalization of the Body vs. Risk-Taking of the Body:
Under patriarchal structures, men's bodies are primarily viewed as tools to achieve external goals (labor, warfare). They possess relatively high bodily autonomy, allowing them to move freely and participate in various social activities. The female body is primarily defined as a vessel for reproduction, its primary social function being to reproduce and perpetuate the bloodline. To ensure this function (especially under patriarchal systems), women's bodies and sexual autonomy are strictly controlled (e.g., through concepts of chastity and the institution of marriage).

Differences in Risk:
In ancient times, childbirth was a highly lethal event. Every childbirth was a life-threatening event for women.

While men also faced dangers such as warfare and hunting, these risks were framed in cultural narratives as pathways to honor, status, and heroism. Death was considered a "glorious sacrifice," while a woman's death in childbirth was seen as "fate" or "misfortune." Advantage: Male infertility frees men from the inevitable internal risk of life. This physical freedom and security allows them to pursue power in the external world without worry.
4. Patriarchal inheritance and the uncertainty of the parent-child relationship
This point, seemingly contradictory, is the key to consolidating patriarchal authority.
The certainty of the mother versus the uncertainty of the father: "Mater semper certa est, pater semper incertus est" (The mother is always certain, the father is always uncertain) is an old legal proverb. Before the advent of DNA technology, a child's blood relationship to the mother was undeniable.While the relationship with the father is questionable, the same cannot be said for the relationship with the father.

Society's "Solution": To ensure that property and title can be passed on to "legitimate" offspring, patriarchal societies have invented a whole system to "solve" this uncertainty. At the core of this solution lies absolute control over women's bodies and sexuality. Marriage, dowry, harsh penalties for female adultery, the virgin complex, and so on are essentially designed to address men's anxiety about "parental uncertainty."

Disadvantage Transformed into Power: In this mechanism, men's biological "disadvantage" (the inability to 100% guarantee offspring) is cleverly transformed into a legitimate justification for controlling women. To safeguard men's inheritance rights, women's freedom is stripped away. This once again demonstrates that the construction of social institutions determines the ultimate significance of biological differences.
Conclusion
Thus, returning to the core of your question, the reason why "male infertility" is considered an advantage is not inherent in male biological characteristics, but rather the result of the systemic construction of patriarchal society. This social system:
Rewards continuity in time, transforming the time capital liberated from male reproduction into power capital in the public sphere.
It creates a public/private value gap, defining the male-dominated sphere as a source of power while simultaneously disparaging women's private labor related to reproduction.
It links bodily autonomy with the right to participate in society, making the male body, free from the risks of reproduction, the standard model for free social participation.
To address the uncertainty of male paternity, systems of marriage and morality were developed to control women, transforming biological inferiority into social dominance.
It is crucial to understand this: we are not discussing biological superiority or inferiority, but how power exploits biological differences to reproduce and consolidate itself.
Social power, corporate leadership, politics, and resource allocation remain largely male-dominated. This is primarily due to the combined effects of multiple social mechanisms: 1) Cultural narratives have long emphasized men's historical roles in hunting, warfare, and other fields, transforming them into symbols of leadership; 2) inheritance laws and property systems have historically favored men, creating an advantage in the intergenerational accumulation of capital; and 3) despite biological similarities, social divisions of labor are still influenced by traditional gender expectations, with educational and career paths being subtly guided. These combined factors ensure that men, despite sharing biological similarities with women, continue to occupy a dominant position in social structures, thus failing to fundamentally eliminate traditional patriarchal social structures. 3.2 Reproductive Health Privacy Rules
Rules: Menstruation is a universal physiological phenomenon, and the market for related sanitary products is mature. However, culturally, discussing these issues publicly in public or during daily social interactions is considered disrespectful and uncultured. This widespread culture of silence may stem from the historical taboo surrounding bodily excretions.

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