Who is girlfriend from A Wild Sheep Chase and what is their importance?

The girlfriend of the main character is present throughout the novel until the last few chapters. Coming into the man's life shortly after his divorce, the woman helps to keep the man as happy as he will allow himself to be. She has three jobs—a proofreader, a call girl, and an ear model. Her ears, according to the novel, have special powers. When her ears are covered, the girl is normal, although good looking and personable in nature.