Interesting read over at PlayboySFW, explaining the major differences in men's and women's attitudes toward casual sex and those who partake in it. My favourite passage:

Ironically, it's this negative attitude toward women who have casual sex that makes many women less likely to seek it out, which means less casual sex for the men who want it most. Based on what psychologists know, I'd argue that if we can work toward a culture where the stigma surrounding women's casual sex is diminished, the result could be more guilt-free hookups for all those who want them.

A little off-topic from most of my links, but a good read.