“If you look at the size of male testicles across the primate species, you can plot the degree of monogamy by the size of the testicles. Chimpanzees have very large testicles for their body size because they’re polygynous, everyone mates with everyone so you need lots of sperm to compete with the male who is there before you. Gorillas and animals … Read Morethat are much more monogamous have much smaller testicles. Humans are somewhere in between—human’s testicles are larger than are necessary for purely monogamous relationships.”
~Dr. Bill Von Hipple, University of Queensland
