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Sex at Dawn

Exploring the evolutionary origins of modern sexuality.
by Christopher Ryan
Christopher Ryan, Ph.D. is co-author of Sex at Dawn: The Prehistoric Origins of Modern Sexuality (HarperCollins 2010). See full bio

Is Monogamy Incest? (Why Men Cheat, Part I)

When partners feel like siblings, sex feels like incest.
Published on August 22, 2009

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Search for a mental health professional near you.

(Adapted from an earlier post "Don't Ask the Sexperts")



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Heartbreak and Home Runs: The Power of First Experiences

How early life experiences shape our character.