Says Deslandes, "In proportion as the intellect becomes enfeebled, the generative sensibility is augmented." The animal passions seem to survive when all higher intelligence is lost. We once saw an illustration of this fact in an idiot who was brought before a medical class in a clinic at Bellevue Hospital, New York. The patient had been an idiot from birth, and presented the most revolting appearance, seemingly possessing scarcely the intelligence of the average dog; but his animal propensities were so great as to be almost uncontrollable. Indeed, he showed evidences of having been a gross debauchee, having contracted venereal disease of the worst form. The general prevalence of extravagant sexual excitement among the insane is a well-known fact. Disease.--Various diseases which cause local irritation and congestion of the reproductive organs are the causes of unchastity in both sexes, as previously explained. It not unfrequently happens that by constantly dwelling upon unchaste subjects until a condition of habitual congestion of the sexual organs is produced, young women become seized with a furor for libidinous commerce which nothing but the desired object will appease, unless active remedial measures are adopted under the direction of a skillful physician. This disease, known as _nymphomania_, has been the occasion of the fall of many young women of the better classes who have been bred in luxury and idleness, but were never taught even the first lessons of purity or self-control. Constipation, piles, worms, pruritis of the genitals, and some other less common diseases of the urinary and genital systems, have been causes of sexual excitement which has resulted in moral degradation. Results of Licentiousness.--Apparently as a safeguard to virtue, nature has appended to the sin of illicit sexual indulgence, as penalties, the most loathsome, deadly, and incurable diseases known to man. Some of these, as _gonorrhea_ and _chancroid_, are purely local diseases; and though they occasion the transgressor a vast amount of suffering, they may be cured and leave no trace of their presence except in the conscience of the individual. Such a result, however, is by no means the usual one. Most frequently, the injury done is more or less permanent; sometimes it amounts to loss of life or serious mutilation, as in cases we have seen. And one attack secures no immunity from subsequent ones, as a new disease may be contracted upon every exposure.