"Augustine of Hippo (350–430 C.E.), an influential bishop of the early Christian church, taught that masturbation and other alternatives to penile-vaginal intercourse —outercourse —were worse sins than fornication, rape, incest, and adultery. He argued that masturbation and other non reproductive sexual activities were “unnatural” sins because they were contraceptive. Since fornication, rape, incest, and adultery could lead to pregnancy, they were “natural” sins and much less serious than “unnatural” sins (Ranke-Heinemann, 1990)."