The couple had a wife-swapping party at the hotel.
Two friends took their wives for a walk together. After roaming all day, when the wives came to the hotel at night, they told their husbands that it looks very boring, there is no excitement. On this, a friend said that we have foursome sex, it will be fun. At first everyone started looking at each other's faces, but after a while everyone agreed and then everyone had foursome sex together, swapped wives.