University of Oslo News Release

Infidelity Leads to Large Testicles

Sexus, an upcoming, 1-year exhibit at the University of Oslo’s Natural History Museum, will teach visitors about sex, sperm, and infidelity—including the fact that unfaithful primates cause their mates’ testes to increase in size. Males with no rivals need only enough sperm to reach their female’s eggs. But if there’s competition, more sperm and larger testes are necessary to have a chance at successful fertilization.

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