|Three Essays on the Theory of Sexuality|
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Outside the Sigmund Freud Museum (Vienna).
Three Essays on the Theory of Sexuality, sometimes titled Three Contributions to the Theory of Sex, is a 1905 work by Sigmund Freud which advanced his theory of sexuality, in particular its relation to childhood.
Sexual aberrations 
Freud began his first essay, on "The Sexual Aberrations", by distinguishing between the sexual object and the sexual aim - noting that deviations from the norm could occur with respect to both.
Discussing the choice of of children and animals as sex objects - pedophilia and bestiality – he notes that most people would prefer to limit these perversions to the insane "on aesthetic grounds" but that they exist in normal people also. He also explores deviations of sexual aims, as in the tendency to linger over preparatory sexual aspects such as looking and touching.
Turning to neurotics, Freud emphasised that “in them tendencies to every kind of perversion can be shown to exist as unconscious forces...neurosis is, as it were, the negative of perversion”. Freud also makes the point that people who are behaviorally abnormal are always sexually abnormal in his experience but that many people who are normal behaviorally otherwise are sexually abnormal also.
Freud concluded that “a disposition to perversions is an original and universal disposition of the human sexual instinct and that...this postulated constitution, containing the germs of all the perversions, will only be demonstrable in children “.
Infantile Sexuality 
In his third essay, "The Transformations of Puberty" Freud formalised the distinction between the 'fore-pleasures' of infantile sexuality and the 'end-pleasure' of sexual intercourse.
He also demonstrated how the adolescent years consolidate sexual identity under the dominance of the genitals.
Freud sought to link to his theory of the unconscious put forward in The Interpretation of Dreams (1899) and his work on hysteria by positing sexuality as the driving force of both neuroses (through repression) and perversion.
Textual history 
The Three Essays were underwent a series of rewritings and additions over a twenty-year succession of editions - changes which expanded its size by one half, from 80 to 120 pages. The sections on the sexual theories of children and on pregenitality only appeared in 1915, for example, while such central terms as castration complex or penis envy were also later additions.
As Freud himself conceded in 1923, the result was that "it may often have happened that what was old and what was more recent did not admit of being merged into an entirely uncontradictory whole", so that, whereas at first "the accent was on a portrayal of the fundamental difference between the sexual life of children and of adults", subsequently "we were able to recognize the far-reaching approximation of the final outcome of sexuality in children (in about the fifth year) to the definitive form taken by it in adults".
There are two English translations, one by A.A. Brill in 1910, another by James Strachey in 1949 published by Imago Publishing  Strachey's translation is generally considered superior, including by Freud himself.
See also 
- J-M Quinodoz, Reading Freud (2005) p. 58
- Sigmund Freud, On Sexuality (PFL 7) p. 45-6
- Quinodoz, p. 59
- Freud, On Sexuality p. 155
- The Basic Writings of Sigmund Freud pages 562-563 Random House 1938
- Freud, On Sexuality p. 155 and p. 87
- Ernest Jones, The Life and Work of Sigmund Freud (Penguin 1961) p. 315
- Gay, p. 147
- Freud, On Sexuality p. 131
- Gay, p. 148
- Angela Richards, "Editor's Introduction", Sigmund Freud, On Sexuality (PFL 7) p. 34
- Peter Gay, Freud: A life For Our Time (London 1989) p. 148
- Richards, p. 35
- Richards, p. 186 and p. 238n
- Freud, On Sexuality p. 307
- Freud, On Sexuality p. 307
- Jacques-Alain Miller ed., The Seminar of Jacques Lacan: Book I (Cambridge 1988) p. 1
- Freud, Sigmund Three Essays on the Theory of Sexuality Basic Books 1962 ix-xi
- Gay, p. 572-575
- Freud, Sigmund (1962). Three Essays on the Theory of Sexuality, trans. James Strachey. New York: Basic Books.
- (1996). Drei Abhandlungen zur Sexualtheorie. Fischer: Frankfurt am Main. [Reprint of the 1905 edition.]
- "Three Contributions to the Theory of Sex" (1920 translation by A.A. Brill, whose translations were often criticized as very imperfect)