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Libido</strong>
The fact of the existence of sexual needs in human beings and animals is expressed in biology by the assumption of a 'sexual instinct', on the analogy of the instinct of nutrition, that is of hunger. Everyday language possesses no counterpart to the word 'hunger', but science makes use of the word 'libido' for that purpose.

Instinct</strong>
Popular opinion has quite definite ideas about the nature and characteristics of this sexual instinct. It is generally understood to be absent in childhood, to set in a the time of puberty in connection with the process of coming to maturity and to be revealed in the manifestations of an irresistible attraction exercised by one sex upon the other; while its aim is presumed to be sexual union, or at all events actions leading in that direction. We have every reason to believe, however, that these views give a very false picture of the true situation. If we look into them more closely we shall find that they contain a number of errors, inaccuracies and hasty conclusions.

Deviations in Respect of the Sexual Aim</strong>
The normal sexual aim is regarded as being the union of the genitals in the act known as copulation, which leads to a release of the sexual tension and a temporary extinction of the sexual instinct - a satisfaction analogous to the sating of hunger. But even in the most normal sexual process we may detect rudiments which, if they had developed, would have lead to the deviations described as 'perversions'. For there are certain intermediate relations to the sexual object, such as touching and looking at it, which lie on the road towards copulation and are recognized as being preliminary sexual aims. On the one hand these activities are themselves accompanied by pleasure, and on the other hand they intensify the excitation, which should persist until the final sexual aim is attained. Moreover, the kiss, one particular contact of this kind, between the mucous membrane of the lips of the two people concerned, is held in high sexual esteem among many nations (including the most highly civilized ones), in spite of the fact that the parts of the body involved do not form part of the sexual apparatus but constitute the entrance to the digestive tract. Here, then, are factors which provide a point of contact between the perversions and normal sexual life and which can also serve as a basis for their classification. Perversions are sexual activities which either (a) extend, in an anatomical sense, beyond the regions of the body that are designed for sexual union, or (b) linger over the intermediate relations to the sexual object which should normally be traversed rapidly on the path towards the final sexual aim.

Touching</strong>
TOUCHING AND LOOKING A certain amount of touching is indispensable (at all events among human beings) before the normal sexual aim can be attained. And everyone knows what a source of pleasure on the one hand and what an influx of fresh excitation on the other is afforded by tactile sensations of the skin of the sexual object. So that
lingering over the stage of touching can scarcely be counted a perversion, provided that in the long run the sexual act is carried further.

Looking</strong>
The same holds true of seeing—an activity that is ultimately derived from touching. Visual impressions remain the most frequent pathway along which libidinal excitation is aroused; indeed, natural selection counts upon the accessibility of this pathway—if such a teleological form of statement is permissible1 —when it encourages the development of beauty in the sexual object. The progressive concealment of the body which goes along with civilization keeps sexual curiosity awake. This curiosity seeks to complete the sexual object by revealing its hidden parts. It can, however, be diverted (‘sublimated’) in the direction of art, if its interest can be shifted away from the genitals on to the shape of the body as a whole.2 It is usual for most normal people to linger to some extent over the intermediate sexual aim of a looking that has a sexual tinge to it; indeed, this offers them a possibility
of directing some proportion of their libido on to higher artistic aims. On the other hand, this pleasure in looking [scopophilia] becomes a perversion (a) if it is restricted exclusively to the genitals, or (b) if it is connected with the overriding of disgust (as in the case of voyeurs or people who look on at excretory functions), or (c) if, instead of being preparatory to the normal sexual aim, it supplants it. This last is markedly true of exhibitionists, who, if I may trust the findings of several analyses,1 exhibit their own  enitals in order to obtain a reciprocal view of the genitals of the other person.2

SADISM AND MASOCHISM</strong>
SADISM AND MASOCHISM The most common and the most significant of all the perversions—the desire to inflict pain upon the sexual object, and its reverse—received from Krafft-Ebing the names of ‘sadism’ and ‘masochism’ for its active and passive forms respectively. Other writers [e.g. Schrenck-Notzing (1899)] have preferred the narrower term ‘algolagnia’. This emphasizes the pleasure in pain, the cruelty; whereas the names chosen by Krafft-Ebing bring into prominence the pleasure in any form of humiliation or subjection.