"It doesn't matter where you get your appetite as long as you eat at home" with that said. Do you feel that foreplay is somethinging that is lacking in your marriage? Porn, stripp clubs, and magazs are a form of foreplay. It like music and soft lighting. It sets the mood for sex.
Now there is a thin line between addiction and hobby. Watch some porn with him. This way you can see if it's a good foreplay for the both of you. If he have a prob or is turn-off then it might be an addiction and the two of you should see someone. If not try to be a part of it.
Sidenote: I don't kno you but men like it when a woman makes a movie for them so don't be hurt that he not watching the movies. It's like a fav Cd you listen to all day everyday for weeks. Then one day you put it aside because you what to listen to something new. But then one day you see the cd, pop it in, and you back listen to it for weeks.