Wolf: Running Is Sex (1982)

First production by Directors' Company. A man stripped bare of all modern values lives in a pure form, like a beast, feeding and satiating his every primal desire whenever they may arise. He takes on a mate, a woman intrigued by his personage or lack thereof, and they live in his den in central Tokyo. As time goes on, we see how this animal clashes with modern man, and the consequences of their coexistance.

Unfortunately the movie Wolf: Running Is Sex is not yet available on HBO Max.