It depends on who's pursuing whom- man initiates, women choose/rejects or vice versa.
A woman knows who she is willing to hook up with, as soon as the dude walks into a room.
I don't agree with that. I wish I had a quarter for everytime a heard a woman say: "I ain't even wanna talk to that nigga, at first, cuz I thought he was ugly; but he started looking good to me the more I got to know him...he aiiight." (Usually, 9 months later, they both end-up in the delivery-room screamin "PUSH!!!", but that's another story.)
Don't give women too much credit...they're just as clueless as men are.