Pretty much gonna agree with the other posters, with one caveat: Just because of his age, is no reason to sweat out that he watches 'teen' porn. As it has been established, these 'teens' are anything but, since it is illegal to make any type of porn movie if one is underage. That said, personally, as a 54 year old woman, I very much enjoy looking at men younger than I am (not teens of course, but in their twenties, early thirties which most of those 'actors' are) and not necessarily because I would entertain the idea of having sex with them. I do appreciate a nice physique and a handsome face. Funny, but if women likes looking at younger men, they're 'cougars'...but if an older man looks at younger women..they're 'dirty old men'. For women to think that way especially since we ourselves have been victims of double standards for so long, seems a bit harsh.
At the end of the day, if the sex is good (and if he says you need to 'give him more' to prevent his porn watching, it is patently untrue but he clearly feels the need to defend himself over something, honestly, he shouldn't have to defend himself over) and he treats you well in every other way, and you're in love with him, then as everyone else above has said, it's up to you. He's been honest. Be honest with yourself. If you can't deal with it, then don't...it's not fair to either of you if you are miserable trying to either contol his viewing or looking the other way.
Btw...there are many very well made-for-women porn films. Not saying you should investigate, but before you toss the baby out with the bath water, you might want to dip in a toe to make
sure it's too hot.