Jean Renoir offered her the role of "Christine de la Chesnaye" in The Rules of the Game (1939), but she preferred to go back to Hollywood.
Had an affair with a famous WWII spy, Dusko Popov, who was Yugoslavian and thought by the Germans to be a spy for them but in fact was a spy for the British. Popov was a very successful double agent and a well-known ladies man, and during WWII was also acquainted with another spy, Ian Fleming, who later used Popov as the basis for James Bond. It sounds like a movie in itself but it's completely true.
Had an affair with composer George Gershwin. It has been suggested by Gershwin scholars that "Love Walked In" was likely written with her in mind. Simone would state in a 1991 interview that "Above anything else in the relationship, Gershwin and I shared a common interest in music".
Her maid revealed that she rewarded men to whom she was attracted with a gold key to her boudoir.