Sissy forever 1º class
In contrast, female chimpanzees are extremely promiscuous. At any given time, the female will have the sperm from at least two or three males inside her vagina. For a male to be sure he is the father he will have to make sure that it is his sperm that will impregnate her. How can he improve his chances?
either deliver the sperm close to the uterus: longer penis
and/or deliver big quantities of sperm: large testicles
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