Is it cheating? They haven't been emotionally compromised while doing either sexual acts. ...

Is it cheating? They haven't been emotionally compromised while doing either sexual acts. In the sense of, they're not going to leave each other just because they had sex with other people. Is it uncomfortable to see that they're performativly cheating on each other? Yes. But these two are adults and are clearly devoted to each other no matter what they do. Does that devotion to a partner mean you can only be with one sexual partner for a given time? Do we as people not involved in that relationship get to make that kind of judgment? I'm relating this out of fiction but this has been the most thoughtful interpretation of relationships and partner integrity I've read in a while. I can't help but relate the contents to a broader spectrum.

I also believe the cheating is a part of getting more scenes to draw hot sex but eh.