It is, however, often very difficult to decide whether we are dealing with a case which is predominantly one of masochism or of foot-fetichism. The nature of the action desired, as we have seen, will not suffice to determine the psychological character of the perversion. Krafft-Ebing believed that the desire to be trodden on, very frequently experienced by masochists, is absolutely symptomatic of masochism.[22] This is scarcely the case. The desire to be trodden on may be fundamentally an erotic symbolism, closely approaching foot-fetichism, and such slight indications of masochism as appear may be merely a parasitic growth on the symbolism, a growth perhaps more suggested by the circumstances involved in the gratification of the abnormal desire than inherent in the innate impulse of the subject. This may be illustrated by the interesting case of a very intelligent man with whom I am well acquainted. C.P., aged 38. Heredity good. Parents both healthy and normal. Several children of the marriage, all sexually normal so far as is known. C.P. is the youngest of the family and separated from the others by an interval of many years. He was a seven-months' child. He has always enjoyed good health and is active and vigorous, both mentally and physically. From the age of 9 or 10 to 14 he masturbated occasionally for the sake of physical relief, having discovered the act for himself. He was, however, quite innocent and knew nothing of sexual matters, never having been initiated either by servants or by other boys.