Cmon Cpunch, of course it's sex--you think he'd be all frustrated if his girlfriend didn't want to eat popcorn and watch the antiques roadshow?
Anyways, this is a situation in which you both are expecting different things out of a relationship. You want to "do things", and she does not. You can't pressure her into doing something she doesn't want to, but you can assess your role, and decide whether or not you want to stay in a relationship without sex. The ball is in your court.