My wife's girlfriends hang out together but don't allow any guys to go out with them yet they also have a couple gay guys that are part of their entourage. They don't dress up as women so why are they allowed in?
Evidently, they feel the gay men won't interfere with the girl talk. Unless the men are very girlie (not every gay man is contrary to what a lot of homophobic people think), the women could be wrong. Besides, dressing like women is called cross-dressing, which is different than being gay. My suggestion would be to let the ladies have fun and have your buddies over for some poker and beer!