The Love Machine by Jacqueline Susann

A novel set in a time when steak, vodka and Benzedrine were the staples of a healthy diet. The "love machine" is Robin Stone, a TV-network titan around whom women flock. Caught up in his meteoric career are three women, each desperate to have him. The Love Machine is Robin Stone. He is a handsome man. Amanda was in love with him. She is a model and has many lovers, but Robin is dearest to her.