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In fact, Freud explicitly binds the "Id" and the oral phase when it notes that "After the primitive oral phase, one can only admit that the investments of object proceed of the Id, which feels the erotic tendencies like needs."

For him, "the oral erotism is the first erotic manifestation just like the nipple is the first sex object."

Freud states elsewhere that the primal experience of the oral stage constitutes that lost paradise as the base of the whole sexual life:

"the act which consists in sucking the maternal breast becomes the starting point of all the sexual life, the ideal ever reached of any later sexual satisfaction, ideal to which imagination aspires in the moments of great need and great deprivation."