I can't even stand the thought of him going. Luckily he doesn't seem to be the type to want to. It doesn't have anything to do with feminism, or viewing women as sex objects. I'm actually ok with that, so long as women aren't ONLY viewed as sex objects (and only at appropriate times.) It just crosses a boundary for us. I would find it disrespectful to us and the intimacy we share. That's something that is reserved for us. In other words, it's cheating to me when it involves a real life women and there is some form of sexual contact. Of course, everyone draws their lines differently. But it is certainly not true that all guys go.
For the record, I don't view pornography as cheating, but I do think it can be... problematic.