The second date I had with my husband, I lured him to my apartment for chicken parmagian and then pretty much attacked him. We were engaged within two weeks.
My point (yes, I have one) is just that if a guy decides he likes a girl, he is going to want to further the relationship whether or not sex is involved. Conversely, if he doesn't particularly like her, sex isn't going to change that either.
So, there's what I think I think!
But I could be wrong; wouldn't be the first time!