La luna (1979)

While touring in Italy, a recently-widowed American opera singer has an incestuous relationship with her 15-year-old son to help him overcome his heroin addiction.

Directed by: Bernardo Bertolucci

Starring: Jill Clayburgh, Matthew Barry, Veronica Lazăr, Renato Salvatori, Fred Gwynne, Alida Valli

Links: IMDb, Movie posters, Movie stills