@miramarco@octodon.social My kneejerk suspicion would be that it relates to patriarchal social norms; such a living arrangement would be liberatory when compared to the much more common dynamic in cishet-allo circles of a mono relationship where the man of the house decides what happens, and their wife is essentially subject to their approval.

(A lot of people aren't that explicit about this dynamic anymore, but it still very much exists in many cishet-allo relationships in more subtle forms, like the insufferable "ball and chain" jokes)

So cishet-allo folks are more likely to live in a patriarchal environment where collective living would break apart the power structures, whereas queer folks are (given their circumstances more generally) more likely to be interested in liberatory forms of living, and so are more likely to feel comfortable expressing such desires because it fits into the broader culture that they exist in.

All of this is conjecture of course, based on my own observations - I may well be off the mark here