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There is "no reason to think that we do more now than in the past, although we are certainly more frank about it," Buss told LiveScience.

Indeed, cultural restraints—rather than anything anatomical—have had the biggest effect on our sexual history, Shorter says.

"To be sure, what people actually experience is always a mixture of biological and social conditioning: Desire surges from the body, the mind interprets what society will accept and what not, and the rest of the signals are edited out by culture," he writes in his book, "Written in the Flesh: A History of Desire" (University of Toronto Press, 2005).

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