Nils Asther and Kay Francis acted together in two films, Storm at Daybreak (1933) and The Man Who Lost Himself (1941).
From Kay Francis: a passionate life and career by By Lynn Kear, John Rossman, McFarland, 2006
Career difficulties, in addition to marital problems, loomed over Kay in the summer... That same month [June 1933], Kay wrote about visiting Nils Asther in his MGM studio dressing room and having a kissing session.
Kay had previously kissed Asther at a party about two weeks before. Quite handsome, Nils was gay, and though he was no doubt flattered, there was no chance of a full-blown romance. They had worked together on Storm at Daybreak, which was filmed in the spring of 1933.