I remember I saw a woman on the forums once, but I can't remember. The post was about some Leap of Death bug. I do have my suspicions about some members being female, but I won't go into specifics?
Why people are so keen on sex? Why people are not just accepting person as a person not as a genderly sex being?
Last that I know of, sex was removed because those who had it set on female, got some harassing PM's or such. Also probably classifies as personal information, which afaik is something that is not wished to be shared on forums. Anyway this world is going to direction where gender is something that one should pretty much ignore, so I think learning thought patterns which does not revolve around sex are beneficial in future world.