The Big Swap

Jack and Ellen, married two years ago, enjoy a happy life together. As usual, they gather with their close friends for a relaxed party—ten men and women in their 30s, making up five couples. They know each other inside out and share a deep bond. However, during casual conversation, the idea of "swapping partners" suddenly comes up. What starts as mere curiosity quickly escalates. They agree to draw lots and engage in a one-night-only sexual encounter, but things don't go as planned...