Imagine there is a venereal disease that instantly kills people. Imagine it takes under an hour from exposure for the virus to bond, resulting in that instantaneous death. Now imagine being a carrier of that disease. Everyone who goes down on you dies within the hour. Everyone you fuck dies within the hour.
I would watch that movie.
Female lead. Doesn't believe in premarital sex. Stays celibate. Gets married. Husband dies in honeymoon bed. She freaks out, hides the body. Runs away. Tries to start a new life. Gets raped. The rapist dies while raping her. Starts using sex to kill people? Fucks bad guys? Criminals? New superhero movie? Or new porno franchise?