XH was a pron addict and it had a huge negative impact on our intimacy. In this case, pron was the problem not a symptom.
When DH worked FIFO 3/1 roster he accessed pron but for his week home we had fantastic intimacy. In this case while not symptomatic of a "problem" it was accessed due to a "challenge" (physically being apart). Neither of us made a big deal of it and it was only mentioned by him because DD wanted to use his iPad so he talked about having to check for anything possibly left on it. For *us*, no big deal.
So i have personal experience of both sides of the coin (healthy v's unhealthy use of pron).
FIFO is hard! We didn't have what it takes and called it quits after less than a year. We could see that it would start to cause relationship issues down the track. DH was working with blokes who had been doing it forever and was shocked at how effed up their relationships were. They would all winge about working so their missus could spend it all, drink every night, use the services of 'ladies of the night'... pron was the least of most of those wives' worries. He was shocked and didn't want to see us end up like that just for money!
I'm assuming if he is on 1/1 you two can make time for counseling. I'd highly recommended this as it sounds like your relationship has fallen into lots of bad habits and you really need to open up and communicate.
It's very easy for us to read snippets and individual incidents and tsk tsk that he's doing no good but we don't know all the ins and outs. We haven't lived your lives to know how your relationship has gotten to this point. If you both want to work at fixing it, or even just working out that the problems are too big to fix and it's time to walk away (as happened with XH and I) relationship counseling should be considered essential IMO, based on my experience of it.