Porn isn't a habit it's an addiction for starters. I would take it as cheating also....but you knew before you moved in together that the problem existed. If he looks as what you say as a joke....he will look at other things younsaybas a joke if they don't agree with his thinking also & that's NOT GOING TO CHANGE WITH TIME. Honestly even if you have fun with the guy, there are more important things in relationships than having fun & that is COMMON VALUES. You would be better off with no one than dealing with serious value differences. Better to wait for someone who has the same values or have no one than to fight over things that will never change as the desire on his part isn't there.....& the addiction is being brushed off & not taken seriously because it's NOT the way he thinks