I think it comes down to social circles, really. I've met a few girls online, mostly through playing WoW, but because of varying stereotypes and downright inappropriate attitudes towards them the majority keep quiet about their gender. The ones that don't seemingly end up trying to use it as a bargaining chip for whatever but uh, well, I digress.
Most of my meat life female friends are gamers of some form or another. Some, maybe most, are gamers to the extent where they can pick up a controller and hold their own on whatever, with a smaller portion being pretty adept at whatever they turn their attention to.
I think yeah, in the past, gaming was seen as a more exclusively male hobby or past-time, but such social conditioning is breaking down anyway, in my experience, and I think the ratio is starting to balance. Sure, I think there's a huge, huge portion of a female player base devoted to what you could call the 'typically' female games - The Sims for example - versus, say the hardcore Gears of War / Halo playerbase, but I don't think the divide is as vast as most people assume.
Of course, 'no girls on the interwebs' could also just be a self-serving myth for geeks like myself to justify not being able to find a girlfriend.