Gender shouldn't be an issue on male-dominated Internet forums, but it is. If I was female I would probably keep it to myself. I'm glad there are at least some women who are willing to deal with the crap and maintain an open presence here.
It's better here than on teamiquid.net, at least.
It's a keyboard forum - it can't be THAT bad.. right? But, then again, I'm an engineer and I've learned that working with 90% men is not bad as long as I work very hard and never ask questions.
In gaming, though, I definitely do not immediately disclose my gender, and I play as a male character on an MMO. With the headsets, it takes harassment to another level. Even with all men, people hiding behind a computer are generally terrible towards each other..