wow I don't know any of these episode names sorry but here goes.
That 70's where Red and Kitty go to a "key" party with Red's friend Bull from the war.
There was a bbc show "coupling" that had swinging touched on in two different episodes.
First Patrick is going to dump his current girl until she mentions the idea of a 3 some. Patrick just doesn't realize she is meaning mmf with her, Patrick, and Jeff.
The other is when a competitive friend of Patrick's "Ivan", want to know if Patrick would be interested in "swapping wives".