An erotic actor or erotic actress or a porn star is somebody who appears in pornographic movies. Many actors/actresses may appear nude in films (usually rather briefly) or on stage but even if they depict sexual behavior they are not considered erotic actors. Most erotic actors use stage names.
... because of a broken leg in 1942's The Man Who Came to Dinner[?], which he had performed onstage before taking it to Hollywood.
Academy Awards and Nominations
1945 ...