I do think there is a place for the law to help teach the people these things, though.
We want the law to balance justice and mercy. Dissuade people who produce and distribute pornography, but cut some slack to people who view it—they are often addicted.
I also think there's a fairly easy line that can be drawn. If a video/film's primary purpose is to portray a sex act, then it pretty clearly qualifies as pornography. I think leaves some room for artistic freedom, even if we as individuals might not view a particular thing as especially artistic.