Za shussan (1986)

The obstetrics and gynecology department where Juri Takahashi is about to give birth is a horrifyingly abnormal hospital. When young women come to the doctor's office, they are always put to sleep under anesthesia. The director and his assistants perform all kinds of acts on them, and they record the scenes with a video camera and collect them.

Unfortunately the movie Za shussan is not yet available on HBO Max.