I knew two couples that swapped spouses on a semi regular basis - all four were reproved. Now all are divorced.
Then a hall I went to was short on elders so elders were sent to help. Oh boy! Elder 1 was removed within 6 months for cheating, they stayed together.
Elder 2 was then sent and within 6 months his wife left him for a worldly guy she met in field service.
Elder 3 was then moved in. His wife got a little too close to one of the young pioneer brothers - bullied a sister that liked said young pioneer - until that sister was effectively shunned from all social activities. Then the married sister slept with young pioneer brother.
In my “worldly” circle of friends for the past 20 years I have never seen anything even remotely like that.