Girls need to get over it. Dudes get harassed as well, with all the taunting and griefing. Bugging a girl for nudes is the internet equivalent of calling a dude a ****** noob. You know it'll get to them and get a reaction.
If you don't want to be hassled, don't go on cam. Or better yet, get off the internet where offense is par for the course.
And yeah, I'm a female and I go on mic in games like L4D. My profile isn't an attention whore photo of myself and the only reference to me being female is my real first name so friend with huge friends lists can remember who I am, and new friends can be sure it's me. Male games don't make a big deal about being male, right? If people give me shit on the mic, I shrug it off. It's not like someone is actually oppressing me.