First off, you already gave yourself reasons to not be put off by it. You watch porn, and so does he. It is just going to happen. It gets stupid, and mildly offensive to him if he knows you do watch porn, and you still get mad at him for doing it.
That being said, try asking him if you want to watch porn together. It could end up being sexy, and you can learn what he is into that he may not have mentioned. And it goes the other way too. Try it out!
-JonesĀ