If you trust him to stay within your boundaries then perhaps talk about what you're happy with/not happy with him doing to you and then see how it goes. As long as both of you are very clear about what's going to happen and you're both okay with it then go for it I suppose
Most porn is literally doing stuff when the person is asleep and getting caught.
So you don't mind if he takes pictures of your sleeping naked body and posts it online, but you would mind if he stuck it in your ass.
No but he doesn't masturbate or watch anything. Besides, what is a relationship without trust, I'm sure he's had plenty of opportunities to take some nudes & share them, but he hasn't.
As long as you consent, then it's not much of an issue. Just say to him what your limits are. Maybe start things off slowly, like try little things and see how you both feel.