Of course it's ok if someone feels that porn IS cheating. I never said it wasn't. I just can't see how one could possibly compare physically being with a prostitute and having penetration/kissing or whatever else goes on with prostitutes to watching a screen with a guy and a girl or a girl and a girl or whoever getting it on.
OP, I agree too that if you really feel that strongly about it then yes, you shouldn't have to put up with it. I guess that's why we have choices to walk away from relationships. I just know that if I had walked away from my DH just because he sometimes likes to watch p o r n, I would have allowed the best thing that ever happened to me walk out of my life. Knowing how amazing he is to me and with me, I would have spent the rest of my life gladly kicking my own a$$.