I saw this film a few years ago; I think it was probably made in the last 10 years? It was Asian, maybe Japanese or Chinese? Korean also a possibility. It was definitely erotic, though not porn (i.e. it was a “real” movie, not a porno), and weird and pretty perverted. I don’t remember a whole lot but here goes; there’s a main female character (MFC) and she has a female friend. MFC invites her female friend and female friend’s husband over to her house. MFC and her husband are hinting to the friend-couple that they do weird things together, and maybe they’d like to join. Husband has MFC get on all fours and pretend she’s a dog and bark. Eventually they get the friend-couple to join in; the female friend pretends she’s a dog too.
Things get progressively weirder and sicker. I think some stuff happens later on with the two women on leashes, on the floor, in some situation where they have to fight, or struggle? And there’s sex involved. I think it all ends pretty badly.
Thanks for your help!!