A frontman is someone who refuses time and again to have anal sex with his girl. Because it's just nasty. Sure, the position's great, but what do we, men, actually get in return? It's just not natural...
Kevin, why won't you have anal sex with me? You're such a frontman.
A: Have you seen Rob theother day? I heard he's a real frontman!
B: Yeah! He's awesome!