Daniel Moore

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For an ape, man’s testicles are medium-sized—considerably bigger than a gorilla’s. Like a chimpanzee’s, human testicles are housed in a scrotum that hangs outside the body where it keeps the sperm that have already been produced cool, therefore increasing their shelf life, as it were.16 This is all evidence of sperm competition in man.
The Red Queen: Sex and the Evolution of Human Nature
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