Film in which Marlon Brando plays Sky Masterson (4,3,5)
I believe the answer is:
guys and dolls
(Other definitions for guys and dolls that I've seen before include "Musical based in Damon Runyan" , "Musical (with blokes and chicks?)" , "Musical from Damon Runyon" , "Damon Runyon book" , "Musical (for both sexes?)" .)