Alex, that sounds like a few campaigns I've been in or run, actually and I second the Thread Necromancer, it's a been an interesting read.
For the record, the most horrible, plastic stereotype "Bimbo with Gun" I ever saw roleplayed (repeatedly, actually, under different names with slightly altered stats) belonged to a female player and I run at around 50/50 with a slight preference for female characters or major NPCs and like to think I manage a fairly credible job most of the time, often because I tend to leave the issue of sex as being mostly cosmetic and sexuality only impacts interpersonal relationships, in my experience, it doesn't make people better or worse at a given role.