Why does a male violate cultural gender rules and dress and act as a woman? Why does a female violate cultural rules to dress and act as a man? Why do some males and females undergo radical medical procedures in order to permanently change their bodies so that they are closer, respectively, to female and male bodies? In this book, a Princeton University-trained physiological psychologist explores dozens of theories about what may spur transsexual and transgender (TSTG) thinking, exposes the myths of fetishism, homosexuality, prenatal hormones, or child rearing as causes, and explains the...