[HK | 18+] Intimate Confessions Of A Chinese Courtesan (1972) aka Ai nu

The Movie opens with a green-tinted prologue in which police inspector Ji De (Yueh Hua) investigates a murder apparently committed by a prostitute named Ainu (Lily Ho Li-li). Flashbacks reveal that Ainu was among a number of maidens kidnapped by brigands under the orders of regal, lesbian Madam Chun (Betty Pei Ti). Although the girl's virginity is auctioned off in the usual manner to a group of rich deviants, Chun is attracted to her beauty and pluck and takes Ainu under her wing.
Soon deeply infatuated, she imparts all of her martial arts skills to the girl, who goes on to become the establishment's number one attraction. When a second murder occurs, Ji deduces that Ainu is eliminating the men who r***ing her years earlier but his hands are tied, as he has no concrete evidence and the suspect enjoys greatprivilege with the upper echelons of society. So great is her protection that Ainu even secretly visits the policeman and openly admits to the crimes but nothing the lawman says to the next targets on her list will dissuade them fromcontinuing their dalliances.