I live in the Bay Area, and it's massive here, yes, although the preferred term is ENM, Ethical Non-Monogamy, because everything is open and discussed.
They would also resent the statement regarding man:woman ratios, as everyone in them is genderqueer, gender expansive, non binary, two-spirit, or something along those lines.
Then there are the endless byzantine discussions about how distinguishing between primary and secondary partners is discriminatory and how to fit in the needs of ace, aro, demi, femme, disabled, vegan folx in the monthly munch.
ALL THE TIME. I find it difficult to believe that any shagging gets done.
Plus the blue hair and piercings, of course. And they think they are being so cutting-edge and saving the world. They're annoying, exhausting, and so, so predictable.