Books featuring prostitutes?

Hey world4ch, I'm looking for suggestions of books featuring prostitutes as protagonists or prominant characters. I'm not looking for erotica; I was hoping for something that focuses more on the life experiences (emotional or otherwise) that people who sell sex must go through.

Examples would be Memoirs of a Geisha (understandably not about a prostitute) or Kushiel's Dart (closer to what I'm looking for, but it dealt more with politics and less with sex). Any suggestions? :)

Fanny by Erica Jong, if you're looking for a historical standpoint. Written in the 18th century style, it's a damned fine period piece about being a woman having to live by your wits.