I can understand completely how you feel. I have a similar problem with my bf, although, mine isn't as bad as yours. Pretty much cut out the porn and the comments....my boy just has a serious habit of checking out girls when I'm with him.....
It really doesn't bother me THAT much, it's just more of an intimidation thing. If a really hot girl walks past and he looks her up and down I get all tizzed up inside cos I know she's got more than me....
But, my only way out was to talk to him about it. For example, we were in subway one night (had the munchies for a chicken fillet....mmmm) anyway, we were there eating and this girl walked in wearing a tight black jumper, a short (I mean, it could pass for a belt) denim skirt and long black boots. She was hot. And I saw my bf look her up and down about 3 times...
When we left I said to him "Rhys, I know it's perfectly normal to check out girls, but don't do it while I'm there, it's just rude. I never check out guys while you're around, dont' do it! I saw you check out that girl in Subway, it p*sses me off!! Don't do it!" He laughed cos he knew I caught him out. He had sort of stopped but I still have to say on quite a regular basis "Hey, darlin, hmmm....I'm over here! You're with me tonight, remember?"
Just tell him straight out that it peeves you off. Guys can usually only see it in black and white. Don't p*ssy-foot around it.
But sometimes in the end, there's no getting through to them. It's always going to be in a guy's nature to see something beautiful walking by. There really is no stopping it....
I mean, like I said, my situation isn't as bad as yours. But if I was in your situation, yeah, tell him to quit the porn, quit the comments, and quit the staring. Straight out. No "Oh, it kinda makes me feel a little insecure and well..." no. That won't get you anywhere.
Yeah, sure tell him how you feel. That it does make you feel as though he has lost respect for you. But all in all, telling him how you feel is telling him that you DON'T LIKE IT. Full stop. There shouldn't be any questioning about it. If he does question it or say "oh, it's only a bit of fun" tell him you don't see it as anything more than disrespect on your behalf and somewhat peverted.
If he can't get enough satisfaction from you and he has to look at porn and other women, ask him what the hell he's doing with you in the first place??
He is a pig and he needs to learn how to grow up or grow a set of balls. Guys who have no respect for how you are felling is usually a sure sign that there's something behind it all. For someone to repsect you, they need to repsect themselves....does that explain it? The guy looks like he lacks respect for himself....IMO anyway....