And this implicit understanding naturally comes with prerequisites.
The first is that the couple has already produced a legitimate heir.
The second is that the infidelity must be discreet, so as not to create a scandal. You can chat and walk arm-in-arm with your lover in public, and even openly invite him to dinner at your home, but you must not let everyone notice that your relationship is unusual. If a situation like that of Lord Byron and Lady Ponsoby years ago arises, then if the husband does not handle it, how can he maintain his face in the upper society?
The third point is an extension of the second: the wife's lover is preferably a person of social status.
