Maybe I should speak from my experience here.
I joined an anime interest club in my uni and guess what? About half were females - initially. Most of the females are average looking, but then again, the guys aren't good looking either. I was a blooming anime fan then so I always thought that the club should consist mostly of guys.
Among the females, there are two attractive female veteran cosplayers. Unfortunately, they rarely appear for meetings and I only see them in cosplay events. Other female members also gradually stopped coming for club meetings. After a few months into the club, I can understand why.
Most of the male otakus just simply too absorbed in playing WS cards and anime games to care about other members. My club president is one such example. Whenever I go to club meetings, the first thing he does is play WS cards all day and don't care a shit about the club. Other male members are too absorbed in touhou or gundam and live in their own universe. The poor secretary, which is a female, have to take care of almost all the events.
I can only conclude that most female otakus will still mix with other male otakus provided they still they can care about other fellow human beings.