<<<So, what's the point, as a woman, of going to an adult site? Does anyone know?>>>
Yes. For a hook up!
Do not kid yourself that there are any fewer (overall) women than men who want casual, no strings attached sex. Not all women are purely romantic creatures who want to be swept away by prince charming...some of us simply want a good lay (sorry, not trying to be crass, just honest).
As a professional and a student I know a lot of women who are married to their careers and dont want to take the time to form a serious relationship...they do however still want to ummm "get their freak on" so to speak. I used to be one of them!
Also, just because a woman is looking for Mr. Right does not mean she isn't also looking for Mr. Right Now. Finding Mr. Right can be a long long road....the occasional fling to satisfy needs or that itch is, IMHO, normal.
When I met DH (online) I knew that at some point I wanted to find my Mr. Right, fall in love and get married. But...at the time I was in no rush and was really only wanting a friend with benefits. Friends with benies lasted about the first date LOL....2 weeks later we moved in and were talking marriage. Strange things happen. :)