Anal sexuality is a relatively rare form of sexual activity, a fact which leads to a misunderstanding of it. Alfred C. Kinsey and his associates, while compiling the research data for their’ massive study, Sexual Behavior in the Human Female, found so few cases that they did not report it as a separate form of sexual outlet. In addition to the rarity of the act, anal sex is overlaid with legal; moral and religious taboos inherited from an earlier age, which conspire to keep the subject hidden behind a curtain of misunderstanding and misapprehension. Anal sexuality is, of course, a favorite mode of sexual activity among male homosexuals but relatively few people seem to realize that the anus can enter into sex play between partners of opposite sexes. Our concern here will be primarily with heterosexual anal activity, though one case reported in this book concerns a male homosexual who relies entirely’ upon anal intercourse for his pleasure. We believe that a factual reporting of these cases may help to clear up some of the misunderstanding concerning anal sexuality. It may come as a surprise to some to learn that the anus can be utilized satisfactorily in sexual activity. This should not be, since: “The anal area is erotically responsive in some individuals. In others it appears to have no particular erotic significance even though it may be highly sensitive to tactile stimulation. As many as half or more of the population may find some degree of erotic satisfaction in anal stimulation, but good incidence data are not available.’ There are some females and males who may be as aroused erotically by anal stimulation as they are by stimulation of the genitalia, or who may be more intensely aroused.” (Kinsey, Sexual Behavior in the Human Female, p. 585.) Given the ingenuity of human beings and the strength of the average sex drive, we can perhaps better understand how at least some individuals have come to capitalize on the sexual potential of the anus.