If people understand sex as a giving act and not a taking one, then there shouldn't be any question as to whether or not a guy should help the woman get something out of the experience. Gentlemen, considering how much crap women put up with from us, I don't think it's too much to ask to give the lady an orgasm or three, even if it means delaying gratification for yourself.
This of course from a man who has never had sex, which doesn't bother me too much. I'll hold out for quality over quantity any day!