Lady Whirlwind aka Deep Thrust is a 1972 Hong Kong martial arts film directed by Huang Feng, starring Angela Mao, Chang Yi and Sammo Hung. Rated R.
A young man (Chang Yi in a rare good guy role) is severely beaten by Japanese mobsters and left for dead on the beach. He is nursed back to health by a pretty young girl and he vows to take revenge on the crooks. Meanwhile, Angela Mao comes to town with a score to settle with Chang Yi. Apparently, her sister was jilted by Chang Yi and she killed herself, so naturally Angela must avenge her by taking his life.