" The threat to the conditions of his existence through the actual or expected arrival of a new child, the fear of the loss in care and love which is connected with this event, cause the child to become thoughtful and sagacious. Corresponding with the history of this awakening, the first problem with which it occupies itself is not the question as to the difference between the sexes, but the riddle: from where do children come? "

― Sigmund Freud , The Collected Works of Sigmund Freud: The Complete Works PergamonMedia (Highlights of World Literature)