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Seulin invites us to consider infantile sexuality not so much from the genetic perspective of an immature sexual that has to give way to adult genital practice but much more as a resource with a creative dynamism that it is valuable to maintain throughout life. All the more so as the pleasure in tension of infantile sexuality seems to open the way to the mode of sublimatory satisfaction from the earliest stage of development. The clinical treatment of perversions shows us, by contrast, how antithetical the terms perverse and polymorphous turn out to be.