I don't think such a database would mean anything though. If these new filters are anything like the filters that mobile networks currently have, there will be

I don't think such a database would mean anything though. If these new filters are anything like the filters that mobile networks currently have, there will be a bunch of false positives, and sites blocked that are sort of "for adults" but not actually pornography. So chances are any adult will want to turn off the filters fairly quickly.