Most of the trannies I know who use second life and other online multiplayer games have female avatars, obviously. But I think the online gender swapping thing is actually quite common. I suppose there are plenty of geeky guys out there who want to design their perfect woman (like in weird science! great film), or maybe there are more closeted trannies than we ever imagined! and the designing the perfect woman thing is just a cover :) Have a look at this, there is even a girl who plays as a boy! :)

Lana:

Oh well maybe shes expressing her male side, Ive seen avatars from an R18 gaming world that are female avs with male genitals lol