I use a gender neutral name on Steam. It doesn't happen often, but I've been harassed for being a girl enough times that I don't use voicechat unless I'm playing with my friends or on a few select servers. I hate the attitude that having a feminine name or not hiding the fact that you're a girl suddenly means you deserve to have drooling dipshits spam you with requests to see your tits and I can get my righteous feminist rage on with the best of them, but it's exhausting and annoying, ir rarely helps or gets them to back down, and sometimes I just want to play some shootan gaems instead of singlehandedly trying to get idiots on the internet to respect women.
As for when I do use a female name -- sometimes I like being called by an actual name. I don't want to use a boy's name because I'm not a boy. That doesn't mean I want special attention or to be treated substantially differently (a friend of mine apologises whenever he cusses in front of me, and it kind of drives me nuts), I just like using a name that I think suits me. The name I use here is obviously female, and I use it because I like it, not because I want to get something from someone.