Just a personal observation (and other friends too). It seems to me that guys in the States do not become friends with the girls first to start dating them. The intention is alwyas shown in the beginning, and if there is none between them, then the guy moves on. Most of my friends in the States believe if you can’t make the girl like you or show some sort of extra interest in you then it can only be in friends in the future. One of guy’s quote is you can go from yes to no, but never from no to yes (not never, but very rarely). I personal, sadly have to agree with that a lot of the time. Although I really don’t agree with that idea. I have spent a year with a girl before, to understand better than no one else (she said herself, and many complicated long story inside, but anyhow), she doesn’t have that kind of feelings toward me in the end, so it’s just friends.
Is that a cultural difference? In Taiwan it is much more normal to become friends with the girl before showing any sort of intention.