The radio was on but I wasn't paying much attention. A woman was being interviewed about a book
. Suddenly my attention was grabbed. She claimed that promiscuous male sexual behaviour characteristic of some animal species correlated with the relative size of the species' male genitalia. By this criterion, she reckoned that human males are biologically predisposed to be mildly promiscuous.
Biologists must therefore interpret current biological form in the light of its evolutionary history. Apes are our evolutionary primate cousins, and if you wished to pick an animal to symbolise strength and virility, the male gorilla automatically suggests himself. The gorilla's flaccid penis is so demure that it is not readily visible. So how does evolutionary biology explain such marked differences in penis and testicle size? Let us look more closely at some arguments commonly used.
The male and female chimpanzee are of similar size. Chimpanzee societies also have power pyramids, but they are more complex and"political" than with gorillas and orangutans. Dominant males have more frequent, but not exclusive, access to females. Evolutionary psychologists explain the large female breast as a secondary sexual characteristic that evolved to attract mates. According to Desmond Morris in The Naked Ape this development coincided with the switch over from front-to-rear to front-to-front mating. In other words, the arousal previously elicited in the male by the sight of the female's pendulous buttocks bisected by a central cleavage was now elicited by the mimicking breast arrangement on the front.
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