Do you think that monogamy is "natural" for humans or did we evolve to be "slutty?" In this Sexploration with Monika special episode, Christpher Ryan, author of Sex at Dawn: The Prehistoric Origins of Modern Sexuality, explains evidence from anthropology, anatomy, & primatology indicating that our ancestors were promiscuous, and not only shared sex partners but lived in egalitarian groups that shared food, child care, and probably didn't really care which baby was whose. Ryan and Jethá confront why long-term fidelity can be so difficult for so many, why homosexuality persists in the face of standard evolutionary logic; and what the human body reveals about the prehistoric origins of modern sexuality. Ryan and Jethá expose the ancient roots of human sexuality while pointing toward a more optimistic future illuminated by our innate capacities for love, cooperation, and generosity. Plus, in this interview recorded at San Francisco's Center for Sex and Culture, Ryan explains why external testicles are like having an extra fridge in the garage just for beer, because you are ready for a party to break out at *any* time. Sexploration with Monika is now on iTunes, and you can download free podcasts anytime at http://www.SexplorationwithMonika.com.