I think I've used one female character as my avatar for my entire illustrious career posting on forums. It was Ririn from Bleach. That looks fairly androgynous though, maybe. I'm pretty sure that when I used her, though, it was after I'd been here for like 5 or 6 years, so it probably didn't confuse anyone. Except maybe newbies.

Then again, there have been people in the past who have thought I was a girl anyway, just from the way I typed. Mostly girls, though. The whole "Wuv, Yer Mom" thing probably doesn't help my case either. Anyhoo...

Wuv, Yer Mom