Anyone who thinks the stuff between someone's legs dictates their skill as a gamer is a moron.
I would say that girls have more exposure though. No one notices that the 15 people who just whipped them were guys, but everyone notices if the last one is a girl.
For instance, I remember playing Mechwarrior Black Knight back in the day and there was a girl who played that game who could school everyone and I mean everyone. She was one of maybe 3 girls who played that game though... (the other two weren't much competition at all).