Just in case you're feeling down because your remorseless ex appears to have more "luck" (and I use that word loosely) than you in the dating/marriage game:
I was glad to read this since my STBX is NOT conventionally attractive: "Dufner offered some caveats about the research, though. 'We were not able to directly test the causality underlying the association between narcissism and physical attractiveness,' he said."
Bottom line? They're fun for a while, but they're not the steady, enduring types that we all hope for. I think it's helpful to remember that.