Amai Muchi (甘い鞭) is a 2013 Japanese erotic drama film directed by Takashi Ishii, based on a novel of the same name by Kei Ōishi [ja] and starring Mitsu Dan, Yuki Mamiya and Tsuyoshi Nakano. It was released on 21 September 2013.

While working as a doctor that treats infertility, Naoko is also the Celica, a masochist girl at SM clubs. She treats patients who adore Naoko like a virgin, and men who want Celica like a true masochistic girl who arouses sadistic feelings. Her double life began when she was 17 years old and endured a terrible incident.