Sanctify by Years & Years:
https://www.youtube.com/watch?v=37lXjnflt9M

Such a great video, about an attraction between a gay and a straight man. Lots of subtext and open to a variety of interpretations. Not explicitly about swinging but with references to sex clubs and a hint of BDSM.

I really like Olly Alexander, he grew up in Yorkshire, not far from where we live. He also did a wonderful documentary recently on growing up gay:
https://www.bbc.co.uk/iplayer/episod...growing-up-gay