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Christopher Ryan: Why is sex such a big deal?
Christopher Ryan is the coauthor of "Sex at Dawn: How We Mate, Why We Stray, and What It Means for Modern Relationships." The book won the 2011 Society for Sex Therapy & Research Consumer Book Award, and other awards.
[Note: We want you to see these talks exactly as they happened! The archive footage might be a little rougher than the usual talk.]
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