I listened to an episode of This American Life a while back. A younger man (18-20) got into kiddy porn on the internet and was trying to stop. He talked about his experiences with different counselors. He never hurt anyone, and never touched anyone.. but, he found it very difficult to find anyone to help him.
He ended up starting an internet site for others who wanted to stop. The group he formed has to be very careful that they don't allow any criminals to get involved with their group.