[cnn-photo-caption image=http://i2.cdn.turner.com/cnn/2009/HEALTH/09/30/why.women.have.sex/art.couple.gi.jpg caption="Many women interviewed were having sex purely because they wanted the experience."]
What makes a woman want to have sex? Is it physical attraction? Love? Loneliness? Jealousy? Boredom? Painful menstrual cramps?
It turns out that woman have sex for all of these reasons and more, and that their choices are not arbitrary; there may be evolutionary explanations at work.
Psychologists Cindy Meston and David Buss, both professors at the University of Texas at Austin, decided that the topic of "why women have sex" deserved a book of its own. They've woven scientific research together with a slew of women's voices in their new collaborative work, "Why Women Have Sex," published September 29 by Times Books.
"We do bring in men occasionally by way of contrast, but we wanted to focus exclusively on women so that the complexity of women's sexual psychology was not given the short shrift, so to speak," said Buss, a leading evolutionary psychologist.
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