No, it's ridiculously presumptuous to try to force other people into relationships that you think they should have.
Well indeed it is. By arguing for a penalty against adultery, I am trying to force people into relationships I think they should have. It has nothing to do with a quintessential foundation of mutual respect and the general equilibrium of a society as a whole, its about what I am trying to force upon others based on my subjective, fleeting, barbaric opinion. Lets all just relish in adulterous behaviour as we deem fit, nothing wrong with that at all. And remember, trying to point out the dire negative effects normalisation of this behaviour will have on a society is an attempt at direct underminement of personal freedom and liberty.
You do realize that your logic can be used in the exact same way to defend all sorts of crimes and / or egotistical behaviour, as long as it is accepted by / normalised in society, dont you.
Reaching for something to hold on to it seems. This is a non- argument. With open marriages both parties agree in advance to not be faithful to eachother - which would make one wonder why they would choose to marry at all, but that is besides the point.
Adultery is predominantly and generally defined as extra marital sexual relations without the consent of all parties involved. Please dont feign to be ignorant of that, however convenient that might be for your case here.