The union of the genitals in the characteristic act of copulation is taken as the normal sexual aim. It serves to loosen the sexual tension and temporarily to quench the sexual desire (gratification analogous to satisfaction of hunger). Yet even in the most normal sexual process those additions are distinguishable, the development of which leads to the aberrations described as perversions. Thus certain intermediary relations to the sexual object connected with copulation, such as touching and looking, are recognized as preliminary to the sexual aim. These activities are on the one hand themselves connected with pleasure and on the other hand they enhance the excitement which persists until the definite sexual aim is reached.
One definite kind of contiguity, consisting of mutual approximation of the mucous membranes of the lips in the form of a kiss, has received among the most civilized nations a sexual value, though the parts of the body concerned do not belong to the sexual apparatus but form the entrance to the digestive tract. This therefore supplies the factors which allow us to bring the perversions into relation with the normal sexual life, and which are available also for their classification. The perversions are either (a) anatomical transgressions of the bodily regions destined for sexual union, or (b) a lingering at the intermediary relations to the sexual object which should normally be rapidly passed on the way to the definite sexual aim.
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