I agree with Schmuck on this one. Your concern will still be there no matter to what anyone else says. I can offer this anyway though:: It's not only a 'man' thing to do. Have you tried it with him before? It's so popular because it's the unattainable and it's very stimulating. It could be a little awkward for you to try it with him the first time, so try it a few times with different types of porn. Maybe try playing them out and changing the idea of porn being exclusively for him to do 'the nasty' into being something to get both of you in the mood TOGETHER.
I could say you're wrong or he's wrong, but you'll have your same opinions and concerns anyway, because they stem from your emotions more than from your rational mind. Either cope with things as they are, or make him give it up and cope with that.
i can understand what you men, but you shouldn't worry. it a guy's thing, to watch porn. unless he then turns you down to watch porn, then it should be fine. maybe you should try watch it with him. i think it's more the idea that the chick wants to have sex more than anything. but maybe talk to him?