Most Helpful Guy
As you get older, and enter the dating world you'd be surprised at how many women are also just looking for a fun night, it does work two ways. While I'll agree sex is usually more important to men, I've met a few women who weren't looking for anything serious, while I was. I think to be in a fulfilling relationship you have to make sure all the boxes are checked. I've had a scenario where I really liked a girl, but that aspect of it wasn't clicking for me.
What I'm saying, is that men will always want sex, but if it feels right, and everything else is great they won't JUST want that from you. If you're worried about it being only about sex, don't give it up so quickly to them, make them wait, and really get to know you.
Most Helpful Girl
It really depends on the guy! Most guys are immature your age. I suggest when your older you start look for mature guy!