The one exception I can think of is on a lemon site I ran across a while back. It was slightly more heavily on the male side of the male/female ratio. They also tended to write a bit better, by and large, but it's hard to tell gender from usernames if you do it right. Granted, I could be prejudced because the female-written ones tended to be either dumb or of the "script" variety. Bleh.