My alliance main is 6/8 HM and I'm female with another female on the team. (10 man team)
My horde main is 5/8 HM and I'm female with at least FOUR other females on multiple seperate teams. (With myself being a main officer over them)
--Mind you, some of the best players I've met are both sexes.
I've been in guilds where the females are flirts and drama queens. I've been in other guilds its been the males. It's normally a balance of who you run into. I am not sure why a HC guild wouldn't want a player based on their sex....well....seeing how SOME females get their gear....
I've been in very bad positions where my Gm would be a husband and wife duo team....wife would hardly show up when she did she was handed loot without any thought. People just accepted it.
It depends on the person. The player. Whenever I've done interviews with raiders, I listen to how they talk, how they word things, what they do/don't know.
I could careless if it comes with something between it's legs or not. Do the job you signed up for.