I believe such an objection is justified. There is really a considerable difference between immature and fully developed functions, as there is a difference between play and reality, between shooting with blank and with loaded cartridges. That the childish libido has the harmlessness demanded by common sense cannot be contested. But of course none can deny that blank shooting is shooting. We must get accustomed to the idea that sexuality really exists, even before puberty, right back in early childhood, and that we have no right to pretend that manifestations of this immature sexuality are not sexual. This does not indeed refute the objection, which, while recognizing the existence of infantile sexuality in the form already described, yet denies Freud’s claim to regard as sexual early infantile manifestations such as sucking. We have mentioned already the motives which induced Freud to enlarge the sexual terminology in such a way. We mentioned, too, how this very act of sucking, for instance, could be conceived from the standpoint of pleasure in the function of nutrition, and that, on biological grounds, there was more justification for this derivation than for Freud’s view. It might be objected that these and similar activities of the oral zones are found in later life in an undoubted sexual use. This only means that these activities can in later life be used for sexual purposes, but that does not tell us anything concerning the primitive sexual nature of these forms. I must, therefore, admit that I find no ground for regarding the activities of the suckling, which provoke pleasure and satisfaction, from the standpoint of sexuality. Indeed there are many objections against this conception. It seems to me, in so far as I am capable of judging these difficult problems, that from the standpoint of sexuality it is necessary to divide human life into three phases. The Three Phases of Life The first phase embraces the first years of life. I call this part of life the pre-sexual stage. These years correspond to the caterpillar-stage of butterflies, and are characterized almost exclusively by the functions of nutrition and growth. The second phase embraces the later years of childhood up to puberty, and might be called the pre-pubertal stage. The third phase is that of riper years, proceeding only from puberty onwards, and could be called the time of maturity.