I used to raid in mists of pandaria (recent expack in wow) with a guy/girl tank
combo. they were engaged irl, but she was SUCH a bomb tank. If she ever couldn't make our raid, the effects were noticeable as basically no one (this is a successful heroic team, keep in mind) could fill her role.
I personally believe that what's between your legs doesn't determine the skill of a player. it's obviously what's in between your ears. between wow and the other FPS games I've played, I've ran with some ladies that would embarrass most of you little jizz stains