Which MMO was that in? I'm working on my own and now I have a new worry on my plate. Short of standard moderation, an algorithm to detect it could be interesting.
You could search for the article about how the Lego mmo (or that's what i think it was) was shut down, then stop worrying about it. Unless you want to spend the rest of your natural life on detecting penises, swastikas and everything else. I mean, everything is offensive to someone.
I realized it would be easy enough to detect when certain lines are forming and manually shuffling the players a few spots, but your comment made me smile. Somewhere in there is the start of a biography title.