While we were clearing out the old house I had the opportunity to come across (and get rid of) boxes and boxes of old porn mags that I doubt he even knew he still had. (I think, before he met me, he had subscriptions - but got rid of them before I moved in.) Anyway, it was ALL very low-key stuff. And the movies he has are pretty conservative as far as porn goes - really nothing kinky at all. (In fact, personally, I prefer a little kinkier porn when I'm in that mood!) But no, it wouldn't really bother me if he liked weirder type stuff - in fact, it would give me an opportunity to make an inroad into maybe helping him with some of his fantasies. When I see he is just looking at women in lingerie playing with themselves, that doesn't leave me with much to work with since, hey, I like doing that too.
It would probably bother me if he was really into gay porn, though. I wouldn't mind an every-once-in-awhile type thing (I actually am intrigued and would love to watch some guy-on-guy stuff once just to see what it looks like - shhhh, don't tell anyone) but if he was looking at a lot of that I would wonder if he's gay.
As for the breastfeeding, he doesn't like to suck on my nipples like he used to because he doesn't want to taste the milk, but he still doesn't mind playing with them. He likes the jumbo look of them when I get engorged.
I've watched him before - the first few times he was uncomfortable with it but he doesn't seem to mind now. (This is in the context of us ML and him finishing himself off that way for whatever reason - like I'm having my period or something.)