Sex is one of the most fundamental forces in nature — and one of the most misunderstood. Today on The Next Big Idea Daily, biologist Lixing Sun upends everything we thought we knew about why sex exists in On the Origin of Sex: The Weird and Wonderful Science of Reproduction. Then historian Rebecca Davis takes us on a sweeping tour of America's surprisingly varied erotic past in Fierce Desires: A New History of Sex and Sexuality in America, revealing that the country has always been far more complex — and far less sexually repressed — than the myths suggest.

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