Threads like this are why people picture a pimply, socially-awkward creepy teenage boy sitting in their parents' basement when someone mentions computer/video games.
Ever been on a multiplayer server with females who use voice when the server does not have explicitly enforced rules about harassment of females? This **** is why many females don't advertise their gender when they do play games. I know a lot of female "gamers," who are pretty great people, but they get royally pissed when people constantly pester or ask them about their gender.
EDIT: And while I'm ranting, just because a woman plays games does not mean she is playing them in the hopes of getting a boyfriend, which seems to be what a lot of obnoxious boys/men like to assume. When it comes to gaming culture, particularly online, it's like a large portion of the men revert to 1950s workplace social acceptability when someone without a Y chromosome shows up.