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Why do people risk everything for love but treat sex like it's no big deal? Why is intimacy the most expensive thing in a brothel? And why do jealousy, infidelity, and heartbreak push otherwise rational people into behavior they later can't explain?

Evolutionary biologist and sex researcher Justin Garcia, executive director of the Kinsey Institute and author of The Intimate Animal, joins Michael Shermer for a candid conversation about the biology of sex, the evolutionary logic of pair bonding, and why love—not lust—is what often pushes people past the point of reason.

Justin R. Garcia is an evolutionary biologist and sex researcher. He is Executive Director & Senior Scientist at the Kinsey Institute. He is also the Scientific Advisor to Match Group and Match.com, where he provides expertise to the company's annual Singles in America study. His research has been featured in outlets like The New York Times, The Wall Street Journal, USA Today, TIME, Cosmopolitan, and Vanity Fair. His new book is The Intimate Animal.