As of the latest check, multiple user-uploaded copies of Liebe unter siebzehn exist on ok.ru. Characteristics include:

(Note: If the specific file you found is actually the 1970 Czechoslovak film "Žerty" / "Jokes" by Jaromil Jireš, which is also sometimes mistranslated under similar titles on ok.ru—that film is also a masterpiece, known for its incredible use of psychedelic 70s cinematography to depict the turbulent inner lives of teenagers!)

Eva Mattes, Gernot Möhner, Karin Götz, Beatrice Richter, and Annemarie Wendl. Writers: Veit Relin, Robert H. Oliver, and Dick Randall. Finding the Film on OK.ru

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Liebe unter siebzehn (English title: Love Under 17 ) is a 1971 West German drama directed by Veit Relin. The film explores the sexual experiences and relationships of teenagers through an episodic narrative structure. Film Overview 1971 Director: Veit Relin Writers: Robert H. Oliver, Dick Randall, and Veit Relin