I so agree with what Daffy says. My ex always liked porn, when we first got together, 23 years ago, it was mags off the top shelf. Then of course with the internet, these photos were just a few clicks away. I ignored it all, we had a great sex life, 4 small kids and I turned a blind eye to it all.
Years later, it had escalated into live stuff on the web, horrible stuff, which you know all to well about. I still ignored it - but started to feel that I had to compete with nubile young women. It went against the grain, these women (many young girls) were exploited and degraded. I lost respect for him, and I started to question whether I wanted to be with a man, who had two teenage daughters himself, watching girls around their age. My teenage daughter stumbled across an open link on the family computer. It was the final straw in the rapid descent of our crumbling marriage.
I blamed myself for not taking him to task about it earlier, and saving my daughter a lot of pain. I will always kick myself for this. She has no respect for him, and feels uncomfortable around him. Then I realised that my only fault was thinking that he had it under control, and that he would have enough sense to make sure that links on the computer (and I am still baffled as to why, with a laptop, phone, etc he watched it on the family computer) would be shut.
It was only through talking it through with a counsellor that I realised that men rarely stop with the soft stuff - it's a compulsion, and like a drug they need more to get the same fix.
Please learn from my mistakes. Don't turn a blind eye, and don't think it will go away.
Like Daffy says, think about what you want, how you want to feel, and leave him to sort this out. This is his compulsion, and he is the only one who can fix it. You can't make him want to fix it. He has to do this.