Unbridled Passions (1981)

Wealthy Olga Arbant, with the help of her submissive husband Paul, enjoys kinky scenarios to help with the writing of her novels, as well as controlling everything and everyone. Impoverished Patrizia, who is a virgin, has agreed to do whatever Olga demands for one month. After being subjected to various humiliations, Patrizia frustrates Olga by developing a mind of her own.