Interesting thread. Thought I'd offer an input being a semi-reformed porn user.
I didn't know about the wholesale exploitation within the industry until a couple of years ago, it hadn't even crossed my mind. I just assumed as it was all legal it should be legit (yeah, yeah I know). I'd stumbled across some of the nasty stuff on redtube and the ilk, but always assumed it was consenting. Not really within my comfort zone anyway so I didn't think about it much.
Then my marriage became sexless and it was only when I started to look for answers to that problem that I came across some of the more readical feminist sites (and subsequently the moderate feminists here) and found out some of the truth about the porn industry. It was a revelation and some of the stuff I guess I was supporting (indirectly) was so offensive I was shocked. In retrospect it was quite obvious, but I hadn't thought about it before.
To use a rather trite analogy, who thinks about the water treatement plants, the hundreds of miles of pipework, the pumping stations and the reserviors when they turn the tap on for a drink of water?
Anyway, I don't use video/photo porn any more, if I'm lazy and can't be bothered to fantasise in my head I use porn literature. It does the same job. Could be worth pointing him in the direction of this kind of porn instead OP?
That's beside any other issues your relationship has of course.