What makes a woman want to sleep with a man, regardless of intentions?

It seems that, generally speaking, women tend to desire sex within the context of a long-term, committed relationship. As a result, a man who wants to sleep with a woman might feel the need to express—or at least entertain—the idea of a relationship to make that happen. This often aligns with the idea that women are the gatekeepers to sex, while men are the gatekeepers to commitment.

But that leads me to wonder: what actually makes a woman want to sleep with a man, regardless of intentions? Is it more about what she personally wants in that moment, or are there certain men who make women willing to break their usual rules? And if so, what qualities do those men tend to have—beyond just being physically attractive?