I would be inclined to keep the parental controls until he's at least 13. Or remove them but not let him use the computer while he's in the confines of his room.
I personally was never subject to any parental controls, and the Internet's never done me any harm, but in those days there was only IRC and the odd forum, and today we've got facebook and all sorts of strange websites.
He IS going to see porn at some point, but I think 11 is a bit too soon