Skamall |
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| gorilla: penis and scrotum are inside the body so that these organs are protected while fighting on the external field. bonobos, chimps and humans have vulnerable external scrotum (associated with promiscuous mating) which keeps testicles few degrees cooler than they would be inside the body, allowing spermatozoa to accumulate and remain viable longer, available if needed. http://www.mendeley.com/research/polygynou...g-yunnan-china/gorillas and gibbons don't engage in sperm competition, generally they are not equipped for it. BUT: the blak-crested gibbon has an external, pendulous scrotum and it is not monogamic... Baker 1996: CITAZIONE without sperm warfare during human evolution, men would have tiny genitals and produce few sperm. ... there would be no thrusting during intercourse, no sex dreams or fantasies, no masturbation, and we would each feel like having intercourse only a dozen or so times in our entire lives. |
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