I posted here earlier tonight and it seems to have disappeared. I shall repeat myself and hope it won't go through as two similar attempts to make the same comment like I often see on other sites.
I said in the past that I play both male and female characters, but I've had a massive temporary downgrade in my computing power so I've returned to old games. Two online ones display account gender in addition to character gender, and I've had trouble with other players' reactions to my display name and gender changing. The initial assumption is usually that I've been hacked, and if I can convince people that I'm the same person then they're often still uneasy and don't want to interact anymore.
In WoW, my mains are on a small server (even after merging) and it has been hard navigating when and to what extent to shake off my old identity and who to tell, and I can't control gossip. And I have certain in-game behaviors that often flag me as female, but that I don't want to change. Luckily vent/mumble balances a lot of that out for me personally.
In games where I only get one character, I usually choose male, but that still depends a lot on the available storylines and character models.