Psychiatrist Jeffrey Satinover examines recent research reported in medical journals (and the popular press). He finds many of these studies flawed and cites evidence that homosexuality is indeed changeable. He explains how psychology, biology, choice, and habit all interweave to produce deeply imbedded patterns of sexual behavior. The model Dr. Satinover develops is based on modern science and psychological understandings of habit, compulsion, and addiction. Homosexuality, he writes, "is one of the many forms of soul sickness that is innate to our fallen nature".