Cheating is unnecessary. Find someone who shares your values instead of lying to yourself or your partner. Then this wouldn’t be an issue in the first place.

Also, in another comment chain you made a statement about monogamy being unnatural. So, what if it is? There are plenty of societal expectations we have that go against human nature that most people would agree are beneficial. For example, fighting is a basic human instinct. It’s done to assert dominance, protect or vent frustration amongst other reasons. This can be even noticed in animals. But, in our society the expectation is that you restrain yourself instead of becoming violent. Unnatural =/= bad.

Just some food for thought.