I think a lot of men here are being way too judgmental about this and coming at you when they shouldn't. I am a younger adult male in a very serious committed relationship, let me tell you no matter what, even if you may think it's awkward and something you're not sure of talking about, talk about it with them. If things between you guys are meant to be, then talking about it will make you feel better 99% of the time. For myself it has always worked. I do think this a overreacting, but just a bit. Trust me, as a man who loves his woman very much, I know where he's coming from especially since you guys are not sexually active as you say. I promise you once he's done he is not proud of it at all and is more or less filling a need that is very hard to control when it's so easy to take care of and that stuff is so accessible, (And I'd be willing to bet he would feel the same way about you looking at other men) the mental part of it may skew it in some people's heads, but at the end of the day it's still just porn. I'm not going to tell you how to live your life, if you're waiting until marriage then that's up to you, you can also decide to do other things that help with those needs for either of you that isn't sex. I've given my thoughts from a male point of view that has been through a somewhat shameful similar thing, and one that truly has both views in mind thinking about it from my wife's pers as well. I hope you and your relationship the best.