Private Lessons(1981)

Phillip Filmore is a naive, 15-year-old, preoccupied with sex, who develops a crush on Nicole Mallow, the new 30-something, French housekeeper and sitter to look after him when Phillip's father is out of town for the summer on a "business" trip. But Mr. Filmore's unscrupulous chauffeur, Lester Lewis, takes advantage of Phillip's crush on Nicole to hire her to seduce the youth, then draws her into a plot to fake her own death in a blackmail scheme aimed to drain Phillip's trust fund.