Well, I can tell you have tried to like the porn, but I'm wondering why it bothers him to have you watch it with him. I assume he would like to use it to have fun with himself while watching it. And your being with him prevents him from doing so. That's my guess, anyway.

Of course, all the girls on it are going to be smaller. Frankly it would bother me if I knew my husband would rather "do it" while watching other woman than have sex with me. Has he ever mentioned being bothered by your weight? Has he always been into porn or is it a more recent thing?

Alas, it can be an addiction. I don't know any magic words to get you to the point where it doesn't bother you, except perhaps if you think about it this way: 1) He really isn't cheating on you, since these are just images on a screen and 2) He is staying with you and married you--not them. (I am assuming your sex life is okay--in that, I mean, he is still having sex with you.)