Besides the harm to the greater frequency, excesses in masturbation offers additional injury through the youth of the individual. Copulation excesses are indulged in by individuals after puberty, i. e., by persons with fully developed generative organs and in full virility. The practice of masturbation, on the other hand, is often begun by mere children, before the genital organs have had time to fully develop, and it is easily seen that excesses will cause greater damage to these undeveloped organs. Hence when young individuals are given to inordinate masturbation, they harm the organs in a higher degree than excesses in copulation. Furthermore, ejaculation in masturbation is forced through purely local manipulation. There is only a local excitation of the nerves. The help of the psyche and phantasy is missing, and the lumbar centres are tasked to the utmost. When the masturbator tries to supply the psychic means, he relies on the fertility and the extravagance of the lewd images which he presents to his mind to increase the libido. Hence masturbation is more injurious because it is generally effected through the influence of an exalted imagination. Very soon the masturbator discovers that visions, once sufficient to produce the requisite excitement, have lost their power, and that the images need to be of a more extravagant salacity. In this way, the masturbator accustoms himself to extraordinary means of sexual gratification, so that attempts of normal copulation are no longer successful. When he attempts coition, he finds that reality is so much less than his imagination has led him to believe and that it is incapable of rousing his appetite.