Don't waste your time trying to stop child nudity sites I have tried and you just go round in circles. Most of these sites are working under the non-explicit loophole and the servers are often based in countries where nobody seems to give a shit.
There are 7 major CP-Nude Art sites all running from Russia and the East side. These are supported by a huge network of link lists CJ sites and spammers most of whom also work from Eastern countries.
The best weapon against these guys is to make entry into our mainstream traffic flow as difficult as possible. When you find a CP site, list or circle take five minutes and look around the page and its links, you will usually come across blatant misuse of some free host, counter or service. Mail the operator and get it shut down.
Tgp?s and list operators should also watch out for the changing links after submission, this is one of their favourite methods of getting traffic from our system. Linking into perfectly legal looking sites is also a method used to hide the blind CP connection.
As for Sunbill and the other CP supporting billing systems, they are just as bad as the site operators, mailing them will get no results whatsoever.
Good fun ? if you see a CP site with a mailing list entry box, fill it full of shit and hold down the enter key, quite often these guys have taken no precautions to check dupes etc and you might even slow the server for a while