Hm. Well, I'm a girl, and one out of my 3 regular players is a girl, and we've had a female guest come in and play, so I guess it's 2.5 out of 5 people.
Really, I prefer the girls (and Jack, who almost counts) as players. The male contingent, consisting of my boyfriend and another guy, tend to be easily distracted, make inappropriate (out of character) jokes, and like to ignore roleplaying in favor of "kill 'em all!". Girls + Jack get more into the game and are far less disruptive.
Hey, if you want to prove me wrong (and live in the Atlanta area) I'd love to hear from you.