"The Diary of a Teenage Girl" is a film from 2015 directed by Marielle Heller. It's an honest and nonjudgmental coming-of-age drama about a young woman's sexual endeavors. The film is based on an autobiographical illustrated novel by Phoebe Gloeckner and is set in San Francisco in 1976.
The story revolves around Minnie Goetz, a 15-year-old girl played by Bel Powley, who enters into an affair with her mother's boyfriend, Monroe, played by Alexander Skarsgård. The film is nonjudgmental about this singularly inappropriate liaison, presented in matter-of-fact terms via Minnie’s diaristic voiceover.
The film has been praised for its entertaining, insightful, and ferociously confident portrayal of a teenage girl's coming of age in mid-70s San Francisco. Despite its confrontational and melancholic tone, the film has been described as the 'Real Thing'. It has a rating of 6.8/10 on IMDb.
Please note that the film is rated R for strong sexual content including dialogue, graphic nudity, drug use, language, and drinking—all involving teens.