Marriages already are in a sense. While “Fault” divorce still exists and adultery is one of those faults, you will pay BIG bucks to go that route. The courts no longer see fault since “no-fault” was introduced (takes up too much time and court resources). My former spouse made mine and my kids life a living hell for over eight years and I was told even though I have enough proof of fault that disintegrated the marriage; even if I won by the time I was done I wouldn’t have anything left to lead a decent life with my kids. In other words, the attorney and judge advocate broke it down to the dollar figures. It was cheaper just going no fault.
I just want to back up what Ghost wrote...
It’s all true: These days, even if every person on that website is caught cheating, their spouses might file for divorce, but adultery means nothing in divorce court. It doesn’t affect child custody or visitation, child support, or property division. Usually, it doesn’t even affect alimony. That’s why most people choose the “no fault” route.