Watching porn isn't cheating. Period. If one does not have ANY interaction (no physical contact, no spoken words, not even text!) with someone outside of the relationship, how is that cheating?I think people need to distinguish between cheating and breech of trust. Cheating is only one kind of breech; there are others that are NOT cheating.
If your partner knows you watch porn, and is OK with it, there is no problem with watching, or with the relationship because of it.
If your partner doesn't know you watch, you should discuss it to avoid major problems.
If you are hiding from your partner that you are watching porn, knowing that they would not approve, you are in an obvious breech of promise scenerio.
Insert just about any major relationship issue where I referenced watching porn and it pretty much applies. You have no problems when honesty and compromise lead the relationship, no matter the topic.