[openknot]

I believe the lack of a moral element is due to Hollywood movies normalizing cheating. I mentioned it elsewhere in these comments, but there's a lot of celebrated cheating in widely popular movies (both classic and modern) like Casablanca, The Notebook, and Sleepless in Seattle.

Perhaps the behavior came before the movies, but I'm skeptical because it seems to be the natural behavior to avoid pursuing people in relationships (it will probably cause emotional trauma for the person in a relationship, as it would be natural to feel guilty about cheating, though I indirectly know of a person in a relationship who seemed to have felt no guilt about cheating at all).

[biztos]

Maybe in America?

When I think of my friends who treat monogamy as situation-dependent, I think that’s more normal in Europe than the US, but I haven’t made a study of it or anything.