A key study in the psychobiology of sexual orientation and its true causes.Since the ground-breaking work of Simon LeVay and Dean Hamer in the early 1990s, a tremendous amount of new research has been carried out by scientists who now understand a great deal more about the biology of sexual attraction. In this book the authors show that attempts to find a sociological cause for homosexuality have little foundation and argue that popular efforts to blame parents or teachers for a child's homosexuality are futile and unjust. Combining their own findings with all the available quantifiable research, the authors have, with this study, provided an urgently needed addition to the major work that has been done in this field.