I spent over a year on a forum that makes Spam look like Mr. Roger's Neighborhood and everyone assumed I was a dude. I had the same name as I do now and always kept rather gender neutral avatars. I never confirmed or denied and it was a lot of fun. Then finally it slipped out but at least by then the tits or gtfo was done in a joking manner. 

Nargle, how long did it you to confirm?