You could go through the list of sites on the EasyList for adblock - which are full of porn site ad block rules - and block those sites. You can change your hos

You could go through the list of sites on the EasyList for adblock - which are full of porn site ad block rules - and block those sites. You can change your hosts file to redirect to localhost or perhaps to some website that reminds you to quit viewing porn or offers you something else to think about.