I knew a guy in an old World of Warcraft guild of mine who told everyone he was a girl for like... I don't even know, a year? Two years? He was huge into roleplaying and, insisting he was a lesbian, he got into all sorts of kinky lesbian roleplay (presumably with other guys who said they were lesbians). We had no idea he was a guy until one day he posted his picture online and we were all completely shocked that he was actually a dude.

Seeing as it was WoW it really shouldn't have surprised us I guess.