exchanging their partners

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I came across something unusual .I found two of my acquaintance in a hill station making love with each others spouses.I happened to see them secretly without their knowledge.they were making love with each other's spouses at an isolated place.when I went to relieve the call of nature(urinate)i saw all this thing What i know is that they are happily married,decent and educated family having children schooling in good school. Now after returning fom hill station I usually observe why they tour so much and why on weekend they generally sleep dine and stay each other's home frequently I wonder how they do it?How their spouses doing it.Do anybody else have ever found such things in reality