I think public perception of swinging has been constructed from a history of rumour, moral panic and sensationalism.
One of the most common media depictions is keys-in-a-bowl, but researchers have failed to locate a single person who could say they went to such an event. Given the wild and varied spectrum of behaviours that people have happily shared with researchers, it is unlikely that this was people were being coy. It is likely that either these events never happened at all, or were so rare that they cannot be considered part of any trend.
It makes complete sense that they can't find verified occurrences if you think about it, The key party trope throws consent to the wind and codifies the behaviour at the ultimate indiscriminate act. It's moral judgement in a can. It also carries connotations of women as chattels that can be traded, which is a weirdly regressive thing to throw into the mix.
On the positive side, it is becoming more common to see media references to key parties be followed by people pointing out that they are not a thing that happens. It is moving to a place of a once believed inaccuracy, much like Marie Antoinette’s 'Let them eat cake'.
I think depictions in fiction are becoming better. Now there are so many sources of media, I think it is easier to get positive representations out there. There have always been writers prepared to make this stuff, but often had to make concessions to get their work in front of people.
In the 80's the show Kate an Ally (about two solo mothers sharing a home) ended episodes with them standing in the hallway reflecting on the day before going to bed. This was caused by a stipulation from the network that they had to be shown to be going into different bedrooms. How absurd this seems now shows that progress does, in fact, get made over time. It's slow, but it happens. We just have to be prepared to nudge things in the right direction when the opportunity arises.
