Photography and all the perfected methods of reproduction of pictures, the increasing means of travel which facilitate clandestine sexual relations, the industrial art which ornaments our apartments, the increasing luxury and comfort of dwellings, beds, etc., are, at the present day, so many factors in the science of erotic voluptuousness. Prostitution itself has become adapted to all the pathological excrescences of vice. In a word, the artificial culture of the human sexual appetite has given rise to a veritable high school of debauchery. The artistic and realistic representations of erotic sexual scenes, so widespread at the present day, are much more capable of exciting the sexual appetite than the crude and unnatural pictures of former days, when, however, erotic objects of art generally belonged to a few rich persons or to museums.

Influence of Repeated Sexual Excitations.—The artificial and varied repetition of sexual excitation, by means of objects which provoke it, increases the sexual appetite. This cannot be doubted, for the law of exercise is a general truth in the physiology of the nervous system. This law, which is also called the law of training, shows that every kind of nervous activity is increased by exercise. A man becomes a glutton by accustoming himself to eat too much, a good walker by exercising his legs. The habit of wearing fine clothes or of washing in cold water causes these things to become a necessity. By continually occupying ourselves with a certain thing, we take a liking for it and often become virtuosos. By always thinking of a disease we are led to imagine that we suffer from it. A melody too often repeated often becomes automatic and we whistle or hum it unconsciously.

Inversely, inactivity weakens the effect of irritations which correspond to it. By neglecting certain activities or the provocation of certain sensations, these diminish in intensity, and we cease more and more to be affected by them. We become idle when we are inactive, for the cerebral resistance accumulates, and idleness renders the renewal of the corresponding activity more difficult. It is not surprising, therefore, to find this law in the phenomena of the sexual appetite, which diminishes with abstinence and increases with repeated excitation and satisfaction. However, another force, that of the accumulation of semen in the seminal vesicles, associated with an old natural inherited instinct, often counteracts the law of exercise of the nervous system, as the empty stomach excites the instinct of nutrition. But, however imperious the hunger, and however indispensable its satisfaction for the maintenance of life, this does not impair the truth of the old saying, "Appetite comes by eating."

The exaggerated desire for sleep experienced by idle people is an analogous phenomenon. Although sufficient sleep is a necessity for healthy and productive cerebral activity, an exaggerated desire for sleep may be artificially developed.

These phenomena are of fundamental importance in the question of the sexual appetite. Here, the well-known axiom of moderation which says, "Abuse does not exclude use" finds its application. An English commentator on Cicero erroneously attributes to him the following: "True moderation consists in the absolute domination of the passions and appetites, as well as all wrong desires, by reason. It exacts total abstinence from all things which are not good and which are not of an absolutely innocent character." This definition is excellent, although it is not Cicero's. It excludes, for example, the use of a toxic substance such as alcohol, which is not a natural food, but not the moderate satisfaction of the sexual appetite which is normally intended for the preservation of the species, for this satisfaction may be good or bad, normal or vicious, innocent or criminal, according to circumstances. In this connection, the application of the right measure, and choice of the appropriate object raise delicate and complicated questions. So-called moral sermons lead to nothing in this domain.

After numerous personal observations made on very diverse individuals who have consulted me with regard to sexual questions, I think I can affirm that when a man wishes to be loyal to himself he is generally able to distinguish between natural desire and artificial excitation of the sexual appetite. To be pursued and tormented by sexual images and desires, even when striving against them, and when the legitimate and normal occasion to satisfy them is absent, is not the same thing as to pass the time in inventing means of artificial excitement to pleasure and orgy while leading an idle and egoistic life. I speak here of the normal man and not of certain pathological states in which the sexual appetite takes the character of a perpetual obsession, even against the will of the patient. By serious and persevering work and by avoiding all means of excitation, the sexual appetite can usually be kept within the bounds of moderation.

We have mentioned above pornographic art as one of the means which artificially excite the sexual appetite. Along with the interested exploitation of the habit of taking alcoholic drinks, exploitation of the sexual appetite constitutes one of the largest fields of what may be called social brigandage. Besides pornographic pictures, the principal means employed to artificially excite the sexual weaknesses of man are the following:

Pornographic novels in which sexual desire is excited by all the artifice of the novelist, and in which the illustrations often rival those we have just spoken of to seduce the purchaser.

Alcohol which, by paralyzing the judgment and will as well as moral inhibitory sentiments, excites the sexual appetite and renders it grossly impulsive. Its first fumes make man enterprising, and he falls an easy prey to proxenetism and prostitution, although it soon weakens the sexual power.

But it is the modern arsenal of prostitution which plays the principal role. The proxenets (pimps) exploit both the sexual appetites of men and the weakness and venality of women. Their chief source of gain consisting in the artificial excitation of the male sexual appetite by all possible means, their art consists in dressing their merchandise, the prostitutes, with attractive refinement, especially when dealing with rich clients who pay well. It is on this soil that are cultivated the most disgusting artifices, intended to excite even the most pathological appetites.