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Why did humans evolve big penises but small testicles?
Male gorilla are also much larger than females, but they have a polygynous or harem-style mating system where many females live with a single male. With little or no competition actually inside the uterus, gorillas have had no need for a testicular arms race to facilitate the production of more and more sperm. Their testes, therefore, are relatively small. This is similar to modern humans, whose testes are also of very modest size and produce a relatively small amount of sperm. In fact human sperm count reduces by more than 80% if men ejaculate more than about two times a day.

The human penis is large when compared with those of our closest relatives: chimpanzees, gorillas, and orangutans. However, primatologist Alan Dixson in his wonderfully detailed book, Primate Sexuality, suggests that if we look at all primates, including monkeys, this is just wishful thinking.

Comparative measurements show the human penis is not exceptionally long. The Hamadryas baboon, for instance, a native of the Horn of Africa, has an erect penis that is five and half inches long – slightly shorter than an average human male, but they weigh only a third of our weight.

The human penis is in fact extremely dull – it does not have lumps, ridges, flanges, kinks or any other exciting feature that other primates have. In primates, this lack of penis complexity is usually found in monogamous species.

Monogamy mystery

This observation clashes with the fact that men are significantly larger than women. This suggests our evolutionary background involved a significant degree of polygynous, rather than exclusively monogamous, mating. This is supported by anthropological data showing that most modern human populations engage in polygynous marriage. Anthropologists Clellan Ford and Frank Beach in their book Patterns of Sexual Behaviour suggested that 84% of the 185 human cultures they had data on engaged in polygyny.

However, even in these societies most people remain monogamous. Polygynous marriages are usually a privilege reserved only for high status or wealthy men. It is worth noting that hunter-gathers around the world practice only monogamy or serial-monogamy which suggests that our ancestors may have used this mating system.

At first sight, however, it would seem sensible for males to reproduce with as many females as possible. Human monogamy has long puzzled anthropologists, and lots of effort has gone in to working out what keeps males hanging around.

Three main theories have been put forward. First is the need for long-term parental care and teaching, as our children take a long time to mature. Second, males need to guard their female from other males. Third, our children are vulnerable for a long time and infanticide could be a risk from other males. So to ensure that children are able to reach maturity the male is likely to stay to protect them, both socially and physically. This may be why males have maintained their larger relative size.

If we view the evolution of monogamy mating systems in humans through the lens of human society it is clear that it takes a huge amount of social effort to maintain and protect more than one mate at a time. It is only when males have access to additional resources and power that they can protect multiple females, usually by ensuring other males protect them. So monogamy seems to be an adaptation to protect one’s mate and children from other males. This monogamy is reinforced by the high social cost and stress of attempting to do this for multiple partners, and it has become supported by cultural norms.

So when living in complex human societies the largest and most important sexual organ is the brain. Somewhere in our evolutionary past how smart and social we are became the major control on our access to sexual partners – not how big or fancy a male’s penis is.
testicles  penis-size  evolution  human-sexuality  mating  breasts  monogamy 
6 weeks ago by thegrandnarrative
Monogamists Are Less Satisfied With Their Relationships Than Polyamorists
Theory: honest communication and continued growth & development is the real key to happiness and satisfaction.
Vice  open_relationships  studies  monogamy  research  polyamory  sexual_orientation  sex  sex_education  interesting  relationships 
6 weeks ago by KuraFire
Explaining Monogamy to Vox - Quillette
In the first episode of their new Netflix series, entitled Explained, the folks over at Vox set out to explain monogamy. Or at least, that is what the title (“Monogamy, Explained”) appeared to promise. But by the time it was over, very little seemed to have been explained.
monogamy  science 
9 weeks ago by kogakure
Jordan Peterson | On the New York Times and “Enforced Monogamy”
Just the plain, bare, common-sense facts: socially-enforced monogamous conventions decrease male violence. In addition (and not trivially) they also help provide mothers with comparatively reliable male partners, and increase the probability that stable, father-intact homes will exist for children.
society  monogamy  male  violence 
12 weeks ago by soobrosa
Future Imaginary Lecture: Kim TallBear. “Disrupting Settlement, Sex, and Nature” - YouTube
We live in an era of decimation dubbed the “anthropocene.” Settler-colonial states such as the US and Canada disproportionately consume the world. As we reconsider violent human practices and conceive of new ways of living with Earth in the face of a feared apocalypse, we must interrogate settler sexuality and family constructs that make both land and humans effectively (women, children, lovers) into property. Indigenous peoples—post-apocalyptic for centuries—have been disciplined by the state according to a monogamist, heteronormative, marriage-focused, nuclear family ideal that is central to the colonial project. Settler sexualities and their unsustainable kin forms do not only harm humans, but they harm the earth. I consider how expansive indigenous concepts of kin, including with other-than-humans, can serve as a provocation for moving (back? forward?) into more sustainable and just relations.

Kim TallBear is an enrolled member of the Sisseton-Wahpeton Oyate in South Dakota. She is also descended from the Cheyenne & Arapaho Tribes of Oklahoma. TallBear originally trained to become a community and environmental planner at the University of Massachusetts, Boston and the Massachusetts Institute of Technology, Department of Urban Studies and Planning (DUSP). She completed in 2005 a Ph.D. at the University of California, Santa Cruz in History of Consciousness. More broadly, she is interested in the historical and ongoing roles of science and technology (technoscience) in the colonization of indigenous peoples and others. Yet because tribes and other indigenous peoples insist on their status as sovereigns, she is also interested in the increasing role of technoscience in indigenous governance. What are the challenges for indigenous peoples related to science and technology, and what types of innovative work and thinking occur at the interface of technoscience and indigenous governance? Into her research she brings collaborations, and teaching indigenous, postcolonial, and feminist science studies analyses that enable not only critique but generative thinking about the possibilities for democratizing science and technology."

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kimtallbear  anthropocene  kinship  indigenous  us  canada  monogamy  polygamy  marriage  culture  society  property  race  racism  settlercolonialism  colonialism  sexuality  gender  sex  intimacy  relationships  families  resistance 
12 weeks ago by robertogreco

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