Neither my husband nor I watch porn (or read it) - but that is a decision we've made based upon our faith and we have made it for ourselves - there is no "letting" the other one do or not do it. We are both adults.
I did read porn some when we were first married and I found that it did not help our sex life at all - it hindered it because I was measuring us up to what I'd read. Why didn't it feel as great as the magazine said it would? (We were living at his parent's house and his stepdad had some porn magazines I'd stumbled across).
Anyway - it is a personal choice we've each made and for us it is basically "off the menu" of the things we like to do.
Of the two of us, I'd be the more likely one to watch porn because his view of it is, "Why do I want to look at something I can't have?" and he doesn't find it entertaining.
The closest that I would come to watching porn now if I were to watch it - would be if they still had the Playboy stripoffs I watched about 27 years ago (I'm sure they must). Now those I did enjoy because I like dance moves and dance movies.
But for us - porn is just something that isn't on our menu by our own choices.