In 2003, a young American woman in London studying for her PhD. ran into money trouble. To support herself while writing her thesis, she joined an escort service. Under the assumed name Belle de Jour, she started to blog her experiences. That blog led to a series of successful, jaunty memoirs beginning with 2005’s The Intimate Adventures of a London Call Girl. The books were adapted for television in the U.K. (where she is portrayed by Billie Piper) and later in the U.S.