Majority of MMO players transvestites?

[Akanbe-]

All my main characters have been male.

My one older childhood friend always plays a female.  When I first asked how his character was doing, he replied "Oh she's on her period."

I'm not surprised he's nearing 30 and still completely single.

For other people, I just never assume.  A lot of people have a ton of alts (at least in WoW) so sometimes they just want a different look.

[Serene Prophet]

Yeah I know I always ask if I tend to strike up a friendship with anyone while im playing, so I at least sorta know whats going on.  Obviously they could still be lying, but for the most part its been the case.

[Hathen]

Generally it depends on the art direction of the game for me. If the male characters are butt-ugly, it turns me off to playing as them for hundreds of hours (Most Western MMOs have this problem for me).