There are still other causes that make marriage difficult or prevent it entirely. A considerable number of men are prevented from marrying by the state. People condemn the enforced celibacy of the Catholic clergy, but they do not mention the fact that a far greater number of soldiers are doomed to celibacy likewise. When an officer of the army wishes to marry, he not only requires the consent of his superiors, he is also denied the free choice of a wife, since it is prescribed that he must possess a certain amount of wealth. In Austria a captain of the army seeking to marry, must give a security of 30,000 florins if he is under thirty years of age, 20,000 florins if he is over thirty; minor officers must give a security of 16,000 florins. In all cases the fiancée of an army officer must have lead an immaculate life, and her standard of living must be suited to his rank. In Germany, officers of the army may seek permission to marry only when they can prove that they have an additional income. The required size of this additional income varies with the different ranks. These are striking proofs of the materialistic conception of marriage maintained by the state. Public opinion in general maintains, that men should not marry until they have attained their twenty-fourth or twenty-fifth year of life. This opinion is founded on the fact that few men are able to support a family before they have reached this age. Only persons who are fortunate enough not to be obliged to win an independent position,--persons of princely rank, for instance,--form an exception. In their case we regard it as quite proper that a man should become married at eighteen or nineteen, and a maiden at fifteen or sixteen years of age. Princes come of age when they are eighteen years old, and are considered competent to rule the most numerous people. Common mortals do not come of age until they are twenty-one years old. This difference of opinion in regard to the age at which marriage is desirable, shows that only social considerations are taken into account, that have no bearing upon man as a sex being. But nature will not be fettered by definite social conditions and the views that have sprung from these conditions. As soon as a human being has attained maturity, the sexual impulse manifests itself with all its vigor.