Well, him being seriously upset means something.....

I don't want to tell you what to do, but I am opinionated ...Sorry...

I had a friend with 2 little girls....you know the rest....So that's why red flags go up for me.

It's fine to request that he never look at that genre again.. It's a fair request.
You should be able to see what he's been looking at....meaning, is he trying to hide it? Why?
Don't forget that porn is acting....these people are not related.
Watch porn with him....I watch with my husband or we don't watch. I'm not controlling, he simply doesn't care to watch alone.....(we make a lot of fun of them and it tends to lead to other things so....)

But those would be MY demands or requests.....explain your discomfort. If he isn't willing to take care of you in this way....then ask why. Are you not important? Is he an open book or not? Why does he need to hide what he does online?

Just some thoughts.....Good luck and email me if you want to discuss more...