Screen legends Katherine Hepburn and Spencer Tracy's relationship has been dismissed as a sham, designed to hide the pair's bisexuality, in a new biography of the actress. In KATE: THE WOMAN WHO WAS HEPBURN, author WILLIAM J MANN draws on never-seen-before documents and interviews with people who wouldn't talk while Hepburn was alive. The book includes the allegation Tracy had an on-off affair with a male mechanic - while Hepburn had flings with at least two girls. Mann includes details about Hepburn's relationships with American Express heiress LAURA HARDING and NIGHTLINE anchor CYNTHIA MCFADDEN, almost 50 years the screen legend's junior. The book is released next month (OCT06).