I've done it a few times for fun in chats while drunk tricking dirty (old) men that I'm this hot 16 year old chick that wants some action (sometimes even younger and the sick thing people still want to chat about sex with me). Then when they least expect it I expose myself and laugh at them getting either mad or scared (because by then I'd have gotten both their mobile number and full name and where they live). Sometimes these guys say the most disgusting things, even knowing that I would be something like 14-16
I have played as a female character on a few private servers in Ragnarok Online because the female characters in Ragnarok Online are cool. Never really experienced any difference in treatment back then though because a lot of people did it because you were free to make any kind of account. And I don't think I've ever been regarded as a female online neither, probably because of my nick pretty much giving it away.
Jam it back in, in the dark.