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 the nearest functions which serve for the introduction of the act;[36] on one side the function of the hand, on the other that of the mouth. The sexual act, however, against which the opposition is directed is replaced by a similar act of the presexual stage, the classic case being either finger-sucking or boring. Just as among apes the foot can on occasions take the place of the hand, so the child is often uncertain in the choice of the object to suck, and puts the big toe in the mouth instead of the finger. This last movement belongs to a Hindoo rite, only the big toe was not put in the mouth, but held against the eye.[37] Through the sexual significance of the hand and mouth these organs, which in the presexual stage served to obtain pleasure, are invested with a procreating power which is identical with the above-mentioned destination, which aims at the external object, because it concerns the sexual or creating libido. When, through the actual preparation of fire, the sexual character of the libido employed in that is fulfilled, then the mouth zone remains without adequate expression; only the hand has now reached its real, purely human goal in its first art.

The mouth has, as we saw, a further important function, which has just as much sexual relation to the object as the hand, that is to say, the production of the mating call. In opening up the autoerotic ring (hand-mouth),[38] where the phallic hand became the fire-producing tool, the libido which was directed to the mouth zone was obliged to seek another path of functioning, which naturally was found in the already existing love call. The excess of libido entering here must have had the usual