1. Female.
2. Yes, I believe it is sexist, just as real life society is sexist, Second Life society is bound to be sexist, being made of real people.
3. Yes, I am limited by my gender. I can't visit anywhere where men and women mingle, especially places on the Adult grid, without being pestered with sex requests, and if I am blatant in my disinterest to the people who bother me, sometimes the response will be hostile. It is hard to find inexpensive and modest clothing, and when I am on the job as a sex worker in SL with my tag showing and all people think it is OK to promise me ridiculous tips, have me tease them for an hour, and then make meager complaints about the establishment that we don't run and pay us about a quarter of what they promised, knowing full well that the tips are our only real wage.
4. On one hand it is people who are a bit more educated who seem to stay in Second Life, the people who are only here for sex don't hang on for long. But, on that note, many educated people are sexist. Still, as a whole I find the Second Life community a bit less sexist than real life, though only nominally.