i roll male/female depending on the class or weapon type, e.g for a melee character especially like a warrior ect its almost always a male, an archer type character will generally be a female for me, i usually stick to my usual alias though weather or not its male or female, its rare that i actually use a female name for a female character and i would never rp on a female, actually i probably wouldn't rp in a game in general but that's beside the point, it also depends on on the character model and the way armor looks, if i dislike the way the male version of a race looks or what ever ill play the female.
but then again i am almost always on vent when talking to people and generally don't talk to people through text, and i don't play f2p mmo's so that the whole getting mistaken as a female thing doesn't exist for me.
also when talking to people the question of male or female is the furthest thing in the back of my mind mainly because i could care less about what gender you are and if i really did care the way some one types typically expresses their gender (not always) but it just blows my mind how stupid some people act in games, even though i am on the internet and i understand that everyone acts ******ed, i just think its ****ing hilarious when i hear anything about some one hitting on a girl in a game.
having gamed with a pretty large number of females it always cracks me up to hear them talk about someone sending them messages, actually one of my old raid leaders in wow was female and anytime we would have to pug some one for our alt runs it seemed like more often then not start hitting on her since she was constantly talking the pug would almost always end up whispering her something like "what are you wearing" and she would reply and talk with the guy for a few minutes then say the conversation over vent for the other 23 of us to laugh our asses off.