Consider the size of a human male’s testicles. They are larger than those of gorillas, whose teeny-tiny balls relative to their body size suggest that only a small amount of sperm was needed to successfully inseminate a female, who is unlikely to have other potential mates (gorillas live in social formations some primatologists still call “harems”—a male and multiple females). A man’s testicles, in contrast, are proportionally larger, arguably more like those of chimps and bonobos, whose females are notoriously promiscuous. Logically, when dealing with a female consorting with multiple males,
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