Whore aka Yo puta movie

A young writer named Elisabeth (unseen except for a voice-over) decides to write her newest book on the worlds oldest profession: prostitution. Based in Los Angeles, Elisabeth travels the world interviewing dozens of prostitutes ranging from call-girls, streetwalkers, even male and female gigolos. While Elisabeth is away, her neighbor Rebecca, an anthropology grad student, is drawn herself into the profession by her call-girl neighbor Adrianna who steers her to her top client Pierre.