Breasts vs. Testes: which primate has the largest? Jared Diamond knows

“Asymmetric adultery laws…genital mutilation of women: these behaviors are unique to the human species, defining humanity as does the invention of the alphabet.”

— Jared Diamond. The Third Chimpanzee: The Evolution and Future of the Human Animal, © 1992, page 73.


So wouldn’t the alphabet reflect this behavior?

According to Diamond, page 72, “The Theory of Testis Size…[has] two trends: species that copulate more often need bigger testes; and promiscuous species in which several males routinely copulate in quick sequence with one female need especially big testes (because the male that injects the most semen has the best chance of being the one to fertilize the egg.)”