I really don't know why people think that this congressionally funded campaign to target people who create and distribute porn depicting "bestiality, urination, defecation, as well as sadistic and masochistic behavior" will do any better than federal government's CANSPAM Act did to reduce junk email.
CANSPAM has basically been a total failure. It failed primarily because trying to regulate the internet is a fool's errand--the more a country manages to suppress domestic violators, the more profitable the prohibited enterprise becomes outside its borders. Users will always be able to find a way around the restrictions as well. The CANSPAM restrictions have only made things more difficult for organizations who do bother to comply with the law.
It's basically axiomatic. Legislation trying to ban a socieotechnological behavior must rely on superior technology, which eventually will be circumvented. Without destroying free society by instituting controls on the client end, regulating the internet is like trying to draw water with a sieve.
In essense, this is the governmental conundrum. No one likes the fact that sick people do sick things. But unless those wrong actions are of such magnitude ipso facto (such as murder) or are common enough (tax evasion, drug use) that they are problems in the aggregate to the civic majority, no action will be taken. In this case, none should.