There are over 6 billion people on the planet. Why do we pick just one and spend an entire lifetime with him or her?

Why do we need sex? Looking back into our evolutionary past, Dr. Sharon Moalem explores the ways in which the struggle to survive and create healthy offspring has determined -- and continues to determine -- our sexuality. From ground-breaking research to strange and fascinating discoveries to an exploration of the roles of culture, biology, and time on sexuality, How Sex Works is an entertaining and comprehensive history of sex that goes far beyond our classic "birds and bees" approach.

I'm so excited and I just can't hide it

So why do we want what we want anyway? How much of what turns us on is hardwired?

Like everything else, attraction and arousal (and possibly love, for that matter) are the products of millions of years of finely tuned biological engineering. And there's really only one goal behind the engineering -- to get you to have sex.