don't lower the rest of us to your standards, just because your morals, values, beliefs, whatever are differant then the rest of us don't try and force us to look at things based on your rational which I can assure you is not the popular choice, people know they are doing soemthing wrong when they cheat, and not everyone sees sex just as something thats purely physical with no emotional connection. Whatever works for you so be it, but most people aren't like you, for one the swinger crowd is extremly small and the average person is quite frankly disturbed by it
The reason I would attack my father or say something like that to my mother has nothing to do with sex, it has to do with respect and the fact that if one of them were to hurt the other like that I would be within my rights as their son to act how I see fit, I do not tolerate that kind of pain being inflicted upon someone if I am within my rights to do something about it (and I am if it directly effects me and you better believe seeing someone I love being hurt like that would) If you honestly believe the issue is just with sex then your extremly narrow minded, and thats fine for you but don't begin to think you can dictate that thought pattern to the rest of us, its far from the norm