What have been the incidents of adulterous behavior (or profound marital temptation) on the show?
Homer was tempted by Mindy and Lurleen, and Marge was tempted by Jacques and Dr. Caleb Thorn (manatee man), but neither acted on it.
Homer’s mom strayed from Abe with Mason Fairbanks and I seem to recall Abe may have been unfaithful, too, but I can’t remember with whom.
Apu got it on with the Squishy lady.
Mayor Quimby is a serial adulterer.
That’s all I can think of offhand. The Flanders and Lovejoys are clean, as are the Hibberts. The Van Houtens were divorced before seeing other people. Selma was faithful to all her husbands (that we know of).
Any other recurring characters/incidents come to mind?