Psychopathia sexualis: With especial reference to contrary sexual instinct

3. The foundation of all masochistic ideas is libido; and as this ebbs

and flows, so do the masochistic fancies. On the other hand, as soon as the ideas are present, they greatly intensify the libido. I am by no means excessively sensual naturally. However, when the masochistic ideas occur, I am impelled to coitus at any cost (for the most part I am driven to the lowest women); and if these impulses are not soon obeyed, libido soon becomes almost satyriasis. One is almost justified in looking upon this as a _circulus vitiosus_. Libido occurs either in the course of time, or as the result of especial excitement (also of a kind that is not masochistic,—_e.g._, kissing). In spite of its manner of origin, this libido, by virtue of the masochistic ideas it engenders, is soon transformed into a masochistic and impure libido. Moreover, there is no doubt that external, accidental impressions, particularly loitering in the streets of a large city, greatly intensify the desire. The sight of beautiful and imposing female forms, _in nature_ as well as in art, is exciting. For those subject to masochism,—at least during the attacks,—the whole external world becomes masochistic. The box on the ear administered by the teacher to the pupil and the crack of the driver’s whip make deep impressions on the masochist, while they leave him indifferent or annoy him when he is not in the masochistic state.