Our Father (2014)

Nobody knows better than Our Father. Sexual tension explodes when a rebellious college student asks her straight-laced stepfather to spank her for her bad behavior. Determined to lose her virginity, a young woman seeks help from her promiscuous stepfather in the hopes that he can teach her the ways of the world. After discovering that his insecure stepdaughter has made an appointment for breast augmentation surgery, a man sets out to convince her just how desirable she really is. Using his knowledge of the medical field, a stepfather convinces his naive daughter into letting him teach her, firsthand, the benefits of anal sex.

Unfortunately the movie Our Father is not yet available on HBO Max.