She did! https://redsails.org/winged-eros/
Briefly, Kollontai promotes “Winged Eros”, which is a multifaceted connection between people, and not “Wingless Eros”, which is sex without friendship or emotion. But on the other hand, she also denounces the bourgeois ideal of love, which is possessive and centered around the economic unit of the married couple, and which denies the multifaceted nature of love.
The essay covers more than just that though: she starts by tracing how ideals of love change as socioeconomic systems develop, and she ends with a discussion of what proletarian ideals of love could be. It’s a great essay.
This is an excellent essay, but I would say that Kollontai would be against hook-ups and hook-up culture… its more that we can form deep, meaningful relationships sans possession, and outside of the framework of bourgeois monogamy.