Bad news.
A girl who gives it up on the first or second date will likely do the same with a guy who also knows how to press her buttons or whom she finds attractive. Such girls are easily guided by their emotions as one of the poster said and have weak moral inhibitors.
I thought that my last girlfriend who actually gave it up on the second date had morals and was slut proof. Boy was I wrong. I later found out after we broke up that she was pretty easy.