Sometimes I feel that guys really have no say on wether to choose who to date unless she chose him already.
On the other hand I've seen girls that want guys and even if he wasn't interested at all, because she really pushed, she end up being with him.
My only conculsion is that girls always have something to offer "sex", so they really have a wider selection to choose from, even though it is obvious they can't choose just anyone, there are limits, but they do pretty good.
Guys sometimes I feel may make the first step, then she notices him and if she likes him, it's on, or girls would make the first step and game over.
But I really doubt there are many situations where girls already knew the guy, but wasn't interested, then he was interested and made her change her mind, I don't think that really happens much. Unlike viceversa which I see all the time.
Most Helpful Guy
Don't work in mammals: http://en.wikipedia.org/wiki/Mate_choice0