I've been lying to you this whole time as well... I'm a wushu computer program pretending to be a girl, pretending to be a guy.
Also on a more serious note, lying and pretending to be someone you're not to get into a clan isn't cool, but that's not always the case. Some people born with a penis identify themselves as girls and want to be treated as such. Genders can be a complicated matter ;o
So, I personnally don't mind if a guy says he's a girl, as long as it's not a lie to get somewhere. Plus, guy or gurl, we treat people the same, so there's no point.