Ever wondered whether humans are meant to be monogamous, or when we started to look at our sexual partners as private property? The authors of the extraordinary book on sexual evolution Sex at Dawn, Cacilda Jethá and Christopher Ryan, study our primate legacy and explain how it shaped human sexual behavior.

In this episode, Ryan talks about the purpose of sexual relations in matriarchal and male-dominated societies, why what we believe about our primate origins is doing us more harm than good as a species, and how to reposition your own beliefs about what is and isn't a sexual taboo.

Stick around after the interview for when Ben Schuman-Stoler joins Caitlin Schiller to talk about the main takeaways from the conversation with Christopher Ryan and helps put together a book list for further reading on sexual evolution, bodies, and biology.

For more info, including links to everything we discussed in the episode and a voucher to use Blinkist for free, go to

Let us know what you thought of the episode, or just give us some book recommendations on Twitter—we’d love to hear from you! Find Caitlin at @caitlinschiller and Ben at @bsto.

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That excellent music you heard is by Nico Guiang. You can find more of it on Soundcloud (https://soundcloud.com/niceaux) and Facebook (https://www.facebook.com/niceaux).