these words to introduce the subject of sex between humans and animals in his monumental nineteenth century study of perverse sexuality, Psychopathia Sexualis. The public attitude toward many deviant sex practices has eased since those harsh Victorian times but the very idea of bestiality seems as "monstrous and revolting" as ever to most people today. The Old Testament, source of most of our basic behavioral taboos, is clear on the subject. In Leviticus 18:23, the Lord lays