Il diavolo in corpo aka Devil in the Flesh 1986 (ITA) [24X7]

An Italian high school student becomes infatuated with a woman he sees outside his class window. Her fiancée is in jail for being involved in a radical movement, and she spends much time in court providing moral support. At first she resists the student's advances, but eventually begins an affair with him. Their situation is condemned by her family and his father, who is the woman's psychologist.