Well-it's a pecularly British thing isn't it ?. Inherited by the Yanks and the other colonies-New Zealand and Australia.
It's part of this protestant moral work ethic and such.
If Bill Clinton had been French the people would have hailed him for getting down and having a bit on the side. Did the French throw their arms up in horror when their divorced president Nicolas Sarkozy married supermodel Carla Bruni?..no their chests swelled with pride.
And what it were Italy-a politician could marry an ex-porn star and would probably be declared president the next day !!