Did you really get the impression from the Lewinsky affair that adultery suddenly became any more acceptable? Monica is whining that her last name is synonymous with a certain sex act, and anytime Leno or Letterman make a Clinton sex joke, its guaranteed to elicit loads of laughter.
Besides, they were never seeking official approval of the relationship, they only wanted to get away with it. Quite a difference between secret adultery, and open polygamy.
Yes, I think morality has shifted. ANYTHING is ok now. Deviantcy has been defined down. If president Kerry did his staff (like that reporter) it would be no big deal.
A former french president had his mistress show up to his funeral, if I remember correctly