wife swapping

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Couple of days back i was reading on net and an article caught my attention. It was about wife swapping. I was shocked that it is even popular in India now in high society. For me it is never justified to even think like this. Where the morality of the public going? I mean this is so unacceptable to me. I don't understand why people do it? How many people of us here are against it? Should it be banned and the persons doing it either forced by spouse or on free will should be punished? what should the punishment be if you think they should be punished?