What makes a girl "dirty" - in a good way?

Well, MeanOldLady is one of our smartest Dopers. :smiley:

But don’t most women like sex? I mean…I don’t know. I just get the vibe that this is all predicated on the assumption that the minute a woman does more than just tolerate sex, she’s some kinky superfreak, whereas most guys are assumed to like sex all the time/any time.