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The relative size of our penis and testes is all down to our mating strategies, and can provide some surprising insights into early human culture. 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. Third, our children are vulnerable for a long time and infanticide could be a risk from other males. Primates exhibit all sorts of mating behaviour, including monogamous, polygynous — where males have multiple mates — and multimale-multifemale. So when living in complex human societies the largest and most important sexual organ is the brain. Humans and spider monkeys are the only primate species without a penis bone. 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.

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Third, our children are vulnerable for a long time and infanticide could be a risk from other males. 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. 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. 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. However, even in these societies most people remain monogamous. Life after Dictatorship.

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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. 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. Help knowledge-based, ethical journalism today. First is the need for long-term parental care and teaching, as our children take a long time to mature.

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Description: 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. Three main theories have been put forward. Great ape sexual organs, compared for size bonobos are flat chested until they get pregnant. The greater this sexual dimorphism , the more likely the mating is either polygynous or multi-male to multi-female. One indicator of which behaviour occurs in a species is the size difference between males and females. 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.
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