I definitely disagree with penetration not getting men off. When I masturbate, I don't apply ANY pressure to my shaft... it's all head focused.

And if it weren't for the fact that I won't be able to actually live with my girl (distance of 4 hours for another year), I would never masturbate.

If it is hard for you to get off during sex then maybe YOU'RE doing something wrong. Maybe you don't know how to have sex? Because I have no problem getting off over and over, multiple times a day (we have a very healthy sexual appetite).