Thank you so much for sharing this. I completely agree and that's been my experience with my friends coming of age now too. Exclusivity is 50-50 among my queer friends and queer adjacent straight friends as well.
I don't know why the Christian values of putting monogamy on a pedestal ended up being so adopted everywhere in the world, but to me it sounds like the really old-fashioned people saying you should only dance with your spouse. It's just an act. No stress either way, just communicate with your partner!