Answer
Although Marilyn Monroe was considered a sex symbol during her time, she was not among the leading ladies of Humphrey Bogart. Instead, Bogart's leading ladies were mostly brunettes with dark hair and eyes, such as Lauren Bacall and Ingrid Berman. This is likely due to the fact that Bogart's image was that of a tough-guy, and he preferred to be paired with women who contrasted his own appearance.