Right up front in the prologue of Ruth Wajnryb’s Expletive Deleted she quotes the following from Richard Dooling on the difficulty in researching “bad language”:
The Library of Congress classification system does not provide a selection of books … on swearing or dirty words. A researcher … must travel to the BF of psychoanalysis, the PE of slang, the GT of anthropology, the P of literature and literary theory, the N of art, the RC of medical psychiatry, and back to the B of religion and philosphy.