Do you visit worlds on the internet far removed from your real life? If you do, which ones?

The internet opens up the possibility of greater interaction between different people, cultures and sub-cultures. The anonymity of the internet also allows people to be more honest and explore areas of life without the fear of public disapproval. All of this means you can really learn a lot about other worlds, sometimes dark, and people, without the censor of a public fa�ade. Given all of this, do you ever visit discussion forums in areas which would ordinarily be beyond your reach in the real world, out of prurient or academic interest? If you do, which ones?