However our testicles are rather small. Three main theories have been put forward. Mark Maslin, The Cradle of Humanity , Author provided Male chimpanzees are much larger than females, and they have a multi-male to multi-female mating system. Essentially, male chimps have sex all the time with any female and with any excuse.
So to ensure that children are able to reach maturity the male is likely to stay to protect them, both socially and physically. Dixson, Primate Sexuality However, even in these societies most people remain monogamous.
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. Hamadryas baboons have unusually long penises. A female therefore may contain sperm from multiple partners at any one time, which puts the sperm itself — and not just the animals that produce it — into direct competition.
One indicator of which behaviour occurs in a species is the size difference between males and females. Essentially, male chimps have sex all the time with any female and with any excuse. Hamadryas baboons have unusually long penises.
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. Second, males need to guard their female from other males. First is the need for long-term parental care and teaching, as our children take a long time to mature. 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.
Mark Maslin, The Cradle of Humanity , Author provided Male chimpanzees are much larger than females, and they have a multi-male to multi-female mating system. 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. Third, our children are vulnerable for a long time and infanticide could be a risk from other males. 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.
Posted by: JoJobei | on October 2, 2012
Essentially, male chimps have sex all the time with any female and with any excuse. This is similar to modern humans, whose testes are also of very modest size and produce a relatively small amount of sperm. Chimps have huge testicles for their size.
However our testicles are rather small. This can be shown by observing chimpanzees and gorillas, our closest living relatives. 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.
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