I used to deal with pr0n in the same way. The kids would just go to another site if I outright blocked their current "interest", but making it way slower using

I used to deal with pr0n in the same way. The kids would just go to another site if I outright blocked their current "interest", but making it way slower using Squid just meant they sat around watching a pic appear pixel by pixel. Between them, they had about 1Kb/sec of our bandwidth; everyone else got the rest. Win-win situation. (They never figured this out, afaict. Never underestimate the sheer determination of a horny teenager.)