Diary of a Mad Housewife (1970)

It can happen to any married woman anywhere, anytime...it happened to Tina.

Tina Balser is a bored New York housewife-mother married to Jonathan, a pompous, social-climbing lawyer who ridicules her in front of their children, criticizing everything she does or wears. She begins an affair with George Prager, a dashing, successful, and blatantly sadistic writer.