I think that not censoring is the only logical conclusion here. The government isn't your kids' parents. Keep them off the internet if you've got a problem with it, or supervise them.
I admit things have changed considerably from my days of watching late night tv in the hope of catching something naughty. I still think most young adults will self regulate their viewing habits.
If anything I think we should have introduced a voluntary meta tag for pornographic content. Perhaps even having ratings for different categories of porn.