Cord (2015)

On a post-apocalyptic world of never-ending winter, a sparse cast of outsiders live underground. Due to their unsanitary conditions, sexual contact has become dangerous. Masturbation has become the paradigm of sexual experience and an array of low-tech devices with this purpose has come into existence. In this bleak reality, Czuperski (a dealer of such machines) and Tania (a sex addict) make a deal: she will allow him to experiment new devices on her body in exchange of pleasure. Soon however, their relationship goes out of control.

Unfortunately the movie Cord is not yet available on HBO Max.