But Gentlemen Marry Brunettes is a 1927 novel written by Anita Loos. It is the sequel to her 1925 novel Gentlemen Prefer Blondes. The plot follows the further adventures of Lorelei Lee and Dorothy Shaw and is illustrated by Ralph Barton. As a sequel to the 1953 film Gentlemen Prefer Blondes, the 1955 film Gentlemen Marry Brunettes used only the book's name and starred Jane Russell and Jeanne Crain as sisters. Source: Wikipedia (en)