The construction of identity is mobile and present ; it has the important quality of being sexual. First of all, the phallic infantile, then, at puberty major readjustments take place because of the experience of the pubertaire. The author describes this “ metamorphosis ” in a number of works which are recalled and brought together here. He now emphasizes on the organization that constitutes the other: what other ? The unconscious of the other in romantic seduction.