The "Other Woman" Speaks Out

For almost two years, Sarah says she and the married man she was dating kept their relationship a secret. When the time came to make a decision he chose his wife over her. "I was discarded," she says. "I had nowhere to go."

To cope with her heartbreak, Sarah says she began writing in a diary. The diary slowly evolved into a book, Having an Affair?: A Handbook for the Other Woman. "If I can help one woman not go through what I went through and waste so much time, then my work is done," she says.

Dr. Callahan says men get away with this behavior because they have women figured out. "They know how to prey on women's vulnerabilities and how to give them that emotional attention," she says. "They'll give you what you want so they can get what they want."