The failure of the function of the sexual mechanism through the fault of the fore-pleasure is generally avoided if the primacy of the genital zones has also already been sketched out in infantile life. The preparations of the second half of childhood (from the eighth year to puberty) really seem to favor this. During these years the genital zones behave almost as at the age of maturity; they are the seat of exciting sensations and of preparatory changes if any kind of pleasure is experienced through the gratification of other erogenous zones; although this effect remains aimless, _i.e._, it contributes nothing towards the continuation of the sexual process. Besides the pleasure of gratification a certain amount of sexual tension appears even in infancy, though it is less constant and less abundant. We can now understand also why in the discussion of the sources of sexuality we had a perfectly good reason for saying that the process in question acts as sexual gratification as well as sexual excitement. We note that on our way towards the truth we have at first enormously exaggerated the distinctions between the infantile and the mature sexual life, and we therefore supplement what has been said with a correction. The infantile manifestations of sexuality determine not only the deviations from the normal sexual life but also the normal formations of the same. THE PROBLEM OF SEXUAL EXCITEMENT It remains entirely unexplained whence the sexual tension comes which originates simultaneously with the gratification of erogenous zones and what is its nature. The obvious supposition that this tension originates in some way from the pleasure itself is not only improbable in itself but untenable, inasmuch as during the greatest pleasure which is connected with the voiding of sexual substance there is no production of tension but rather a removal of all tension. Hence, pleasure and sexual tension can be only indirectly connected.