Preceding Freuds Three Contributions to the Theory of Sex by more than twenty years, Richard von Krafft-Ebings Psychopathia Sexualis pioneered the psychological study of sexual behavior. This classic nineteenth-century work on sexual aberration addressed such previously taboo subjects as bestiality, cunnilingus and fellatio, fetishism, incest, masochism, masturbation, nymphomania, and sadism, making it the first serious attempt to catalog and define such deviations. For almost one hundred years ...