Because of strict censorship imposed by the era's Studio Production Code, no mention at all is made of Cole Porter's real-life open homosexuality, or the fact that his marriage to Linda Lee Thomas, though caring and convivial, was not a romantic or sexual one.
When a friend of Cole Porter's heard that Cary Grant had been cast to play the songwriter in the film of his life, the friend asked Porter why he had not objected since he and Grant looked nothing alike. The friend pointed out that Porter might have suggested Fred Astaire instead, another good friend of his who had a strong physical resemblance to Porter. Porter replied, "If they wanted Cary Grant to play you in a movie, would you complain?"
When the studio asked Cole Porter who he might like to play him in the movie, Porter suggested Cary Grant as a joke. He thought Grant was about as far from himself as you could get. The studio went out and signed Grant to play the role.