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[[Freud]] first described the [[castration complex]] in 1908, arguing that the [[child]] -- on discovering the [[biology|anatomical]] [[sexual difference|difference between the sexes]] -- the [[presence]] or [[absenseabsence]] of the [[penis]] -- makes the assumption that this [[sexual difference|difference]] is due to the [[female]]'s [[penis]] having been cut off.<ref>{{F}} "[[Works of Sigmund Freud|On the Sexual Theories of Children]]". 1908. [[SE]] IX. p. 207</ref>