View image of Bonobos seem to be less violent than chimps Credit: This suggests our evolutionary background involved a significant degree of polygynous, rather than exclusively monogamous, mating. So to ensure that children are able to reach maturity the male is likely to stay to protect them, both socially and physically.

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You might also like Neanderthals were just too macho for culture. By clicking 'Send to a friend' you agree ABC Online is not responsible for the content contained in your email message.

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Evolution Primates Human evolution testes penis testicles. 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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In , researchers found that mothers helped their sons to get closer to and more matings with estrus females. This may be why males have maintained their larger relative size.