Yep...the Beast is nothing to look at, either. When she was young, she was OK looking at best. But as you say, Bridget, she is more than willing to do anything and everything he wants in the sack. WK is the only person in the entire household who tolerates her in the slightest.
As the late, great George Carlin said, 'Respect should be earned, based on the parent's performance!' She'll never earn respect from anyone, especially once they get to know what she's really like. She, like your husband's OW, went after WK's predecessor while he, too, was still married - in fact, Beast was moving her stuff into her now-ex's place while his wife was moving hers out!!!!! As in, on the very same day! In my case, I hadn't been gone THREE DAYS before the bltch started encroaching her own property into the house! WK could've stopped it at any time, he just chose not to. So I blame both of them equally.