Play
Foursome after dinner
Plates cleared. Two couples. Nobody goes home with who they came with.
Swingers swap. That is the whole point.
Outdoor couples already mixed. Foursome after the plates are cleared. Pool party that turns after midnight. German club, same rules as a London one. Charley Hart with his friend at New Year. A wife taking BBC at her husband's BBQ.
Party for the room. Partner swap if she goes with his mate. Club for the swing house. Hotwife if he watches. Pool if it starts in the water.