As it has become so readily available, more and more men are seeming to have issues with porn. Whether or not your boyfriend is "addicted"? Only he and you can answer that question by going to a therapist pr taking a self-assessment test.

But, I would say he has a problem with respecting your "boundaries" or "limits". You've told him you don't want to hear about those types of fantasies or graphic sex talk, yet he ignores you. That's a warning flag to me that he's not mature enough or capable of "respecting" your boundaries.