None of these reforms, however, need in any way debar the formation of voluntary marriage contracts. Such contracts are, indeed, distinctly advisable, for the voluntary resolve of two people to remain faithful to one another, and to build up a permanent home for their children, is at once the best, truest, and most natural foundation of marriage. But no one can foresee the future, and therefore simple facilities for divorce must be provided in case it becomes intolerable or inexpedient for the two persons to live together any longer. A divorce must take place if one or both of the parties wish for it. The State and the Law must only have the right to demand the fulfilment by the parents of all obligations towards their children. Marriage contracts for a fixed period are therefore as such not immoral. Such agreements have even been recommended by the Christian philosopher Charles Secrétan, in his book _Le Droit de la Femme_. Sterile marriages, or other sex relationships, must be free. The law has no concern with them as long as they do not involve injury to any one’s property, health, or personal will. They are in themselves ethically indifferent. On the other hand, all sexual intercourse which is bought or sold, such as marriage for money, the keeping of paid mistresses, and the whole system of prostitution, is immoral, because it is corrupting and devoid of love, and amounts simply to plunder by the aid of money. Prostitution is a hotbed of sexual vices and abnormal practices. By its means the sexual instinct is perverted and led astray into every imaginable bypath, while women are degraded in the basest of all slaveries. Most repulsive of all, from the point of view of ethics, is the trade in prostitutes known as the “white slave traffic,” with its criminal devices for the enticement, intimidation, and seduction of young girls. The traffic in waitresses for cafés and beer-gardens is often little better. It is sad enough to reflect that these loathsome outgrowths of sexual immorality often still enjoy the protection of the State, and that many medical men defend their continuance under the pretext of hygiene. It is just in this very respect that we see that social hygiene and ethics are one and the same thing. Only the idiotic one-sidedness of your specialist could declare such a monstrosity as State-established prostitution to be hygienic. A system which makes for the mental and physical ruin of the race cannot be hygienic, and the delusion that by its aid men are protected from venereal disease is in direct conflict with the actual facts.