Check to the Queen (1969)

She Had Everything Except the Bondage and Humiliation She Craved

Silvia is young, beautiful and rich. When her husband goes on a business trip, she starts working as a secretary for Margaret, a famous film star. Margaret appears to have no problems giving her what she wants and turns her into a sex slave- little by little, she subjects herself to increasingly serious humiliations in a masochistic relationship.