I think I probably have fairly lenient ideas in this area, but to me, that's just a guy being a guy. I'd definitely prefer it if the guy didn't hide this part of his life or lie about it, but perhaps he does that because he can anticipate what the reaction on the female partner's part will be.

Yeah, men do have stronger urges than we do, and they have sexual thoughts a lot more frequently. They just need to blow off that steam, and frankly, I think porno or a fantasy about someone else is a heck of a lot better than cheating. I truly do just think this is a guy thing and that, unless his solo porn activities become excessive and he is no longer interested in the real sex part of the relationship, it doesn't have much reflection on his attitude toward the relationship.