[22] The analyses of neurotic disturbances of walking and of agoraphobia remove all doubt as to the sexual nature of the pleasure of motion. As everybody knows modern cultural education utilizes sports to a great extent in order to turn away the youth from sexual activity; it would be more proper to say that it replaces the sexual pleasure by motion pleasure, and forces the sexual activity back upon one of its autoerotic components. III THE TRANSFORMATION OF PUBERTY With the beginning of puberty the changes set in which transform the infantile sexual life into its definite normal form. Hitherto the sexual impulse has been preponderantly autoerotic; it now finds the sexual object. Thus far it has manifested itself in single impulses and in erogenous zones seeking a certain pleasure as a single sexual aim. A new sexual aim now appears for the production of which all partial impulses coöperate, while the erogenous zones subordinate themselves to the primacy of the genital zone.[1] As the new sexual aim assigns very different functions to the two sexes their sexual developments now part company. The sexual development of the man is more consistent and easier to understand, while in the woman there even appears a form of regression. The normality of the sexual life is guaranteed only by the exact concurrence of the two streams directed to the sexual object and sexual aim. It is like the piercing of a tunnel from opposite sides. The new sexual aim in the man consists in the discharging of the sexual products; it is not contradictory to the former sexual aim, that of obtaining pleasure; on the contrary, the highest amount of pleasure is connected with this final act in the sexual process. The sexual impulse now enters into the service of the function of propagation; it becomes, so to say, altruistic. If this transformation is to succeed its process must be adjusted to the original dispositions and all the peculiarities of the impulses. Just as on every other occasion where new connections and compositions are to be formed in complicated mechanisms, here, too, there is a possibility for morbid disturbance if the new order of things does not get itself established. All morbid disturbances of the sexual life may justly be considered as inhibitions of development. THE PRIMACY OF THE GENITAL ZONES AND THE FORE-PLEASURE From the course of development as described we can clearly see the issue and the end aim. The intermediary transitions are still quite obscure and many a riddle will have to be solved in them.