Then don't enter into relationships where that's a rule, or negotiate alternatives 🤷‍♂️ I'm not going to say there aren't circumstances where cheating is *understandable*, but it's still a bad thing to do, even in the scenario you describe. Taking the abused and neglected cheating partner's perspective - what happens when your partner finds out? What happens when someone else finds out and uses this information to blackmail you? Are you really going to be better off than you would've been making and executing an escape plan instead? Cheating almost always outs. Everyone thinks they're going to be the exception, but by definition few are. If you're unhappy in your relationship, either get all people in the relationship onboard to start addressing that, or leave. If leaving is going to create problems, prepare in advance to address those problems. IMO you'll be better off for it v. cheating.