I have been driven to regard as the earliest recognizable sexual organization the so-called “cannibalistic” or “oral” phase, during which the original attachment of sexual excitation to the nutritional instinct still dominates the scene. It is not to be expected that we should come upon direct manifestations of this phase, but only upon indications of it where disturbances have been set up. Impairment of the nutritional instinct (though this can of course have other causes) draws our attention to a failure on the part of the organism to master its sexual excitation. In this phase the sexual aim could only be cannibalism – eating… It is well known that there is a neurosis which occurs at a much later age, in girls at the time of puberty or soon afterwards, and which expresses aversion to sexuality by means of anorexia. This neurosis will have to be brought into relation with the oral phase of sexual life. The erotic aim of the oral organization further makes its appearance at the height of a lover’s paroxysm (in such phrases as “I could devour you with love”) and in affectionate intercourse with children, when the grown-up person is pretending to be a child himself… Permanent marks have been left by this oral phase of sexuality upon the usages of language. People commonly speak, for instance, of an “appetizing” love-object, and describes persons they are fond of as “sweet”… In dreams sweet things and sweetmeats stand regularly for caresses or sexual gratifications.
Sigmund Freud – Three Case Histories p.265