I have a couple different internet identities. I don't try all that hard to keep them separate, but they are separate. I don't need to link my comments in gaming communities to my comments on Dreamwidth to my sex blog, and I certainly don't need to link all those things to my real name. Regarding the sex blog, because of the world we live in, it would at least endanger my and my husband's professional chances to link it with everything else. And there are very good reasons for women to keep their real names private on the internet. A whole lot of internet activism would die if people had to use their real names on the internet. Which I suspect is one reason why certain people want that to happen.