Just Tell Me What You Want is a 1980 American comedy film directed by Sidney Lumet. It stars Ali MacGraw, Peter Weller and Alan King, and was also Myrna Loys final film.
Max Herschel, the married, wealthy, vulgar, egotistical, middleaged head of a corporate empire, is satisfied with the somewhat casual lovehate relationship he shares with his mistress and protegee, television producer Bones Burton, just as it is, but she wants a more serious commitment.The young woman attempts to extricate herself from the affair or perhaps force her lover into taking the next, more permanent step by dating a younger man, offoffBroadway playwright Steven Routledge. Max, however, is not a man to accept defeat in any of his endeavors, and he retaliates with a vengeance. ........
Source: Wikipedia