What a tremendous phrase! I guess it's meant to be amusing. "adultery" is a black-and-white thing.
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AnonymousDo you maybe have some other ideas?I'm afraid not. To me it means nothing more than "mild" + "adultery". And, as I say, the idea that there could be a mild form of adultery -- i.e. a form that is somehow less serious or severe -- strikes me as an amusingly strange one.
AnonymousDo you maybe have some other ideas?REPOST.