How could they leave us so soon?
And if that holds no interest for you (heathen!), go read this, which confirms what I've long suspected. It's not that women are less interested in casual sex than men because of some sort of inherent difference, it's because most men are really bad at it... the vital bit (emphasis mine):
In a newly published paper describing a series of studies, University of Michigan psychologist Terri Conley asserts that "when women are presented with proposers who are equivalent in terms of safety and sexual prowess, they will be equally likely as men to engage in casual sex."
Her research suggests women, like men, are motivated by pleasure-seeking when they enter the sexual arena. It’s just that women are less likely to be satisfied by a short-term encounter, and they know it.