Predictably, by far the most common answer to yesterday's survey was "cheating." You also mentioned rape, incest, lying of any kind, lying about money, prolonged unemployment, physical abuse, cruelty to animals, drug addiction, porn, and strip clubs, among others.
With regard to cheating, men were categorical about it. No cheating of any kind. Period. Fini. We're simple that way. Women, however, often qualified it: not if it's serial, not if it's more than once, not if it's more than one partner, not if it's love. Much allowance was given for a single drunken mistake. I'm tempted to write one Stank troll's husband and let him know he's got one "get out of jail free card" coming to him.
It's not often I identify more with men than with women, but here I toe the gender line. One and we're done. The details don't remotely interest me; in fact, after the Big, Stinky Detail is revealed, I'd rather not hear any more. Does that make men less tolerant than women? More possessive? Less inclined to rationalize away betrayal? Maybe.