[204] Freud (Drei Abhandlungen zur Sexualtheorie, p. 118) refers to the sexual pleasure of swinging.  Swinging another person may be a source of voluptuous excitement, and one of the 600 forms of sexual pleasure enumerated in De Sade’s Les 120 Journees de Sodome is (according to Duehren) to propel a girl vigorously in a swing.

[205] The fact that horse exercise may produce pollutions was well recognized by Catholic theologians, and Sanchez states that this fact need not be made a reason for traveling on foot.  Rolfincius, in 1667, pointed out that horse-riding, in those unaccustomed to it, may lead to nocturnal pollutions.  Rohleder (Die Masturbation, pp. 133-134) brings together evidence regarding the influence of horse exercise in producing sexual excitement.

[206] A correspondent, to whom the idea was presented for the first time, wrote:  “Henceforward I shall know to what I must attribute the bliss—­almost the beatitude—­I so often have experienced after traveling for four or five hours in a train.”  Penta mentions the case of a young girl who first experienced sexual desire at the age of twelve, after a railway journey.

[207] Langdon Down, British Medical Journal, January 12, 1867.

[208] Pouillet, L’Onanisme chez la Femme, Paris, 1880; Fournier, De l’Onanisme, 1885; Rohleder, Die Masturbation, p. 132.

[209] West-Riding Asylum Reports, 1876, vol. vi.

[210] Das Nervoese Weib, 1898, p. 193.

[211] In the Appendix to volume iii of these Studies, I have recorded the experience of a lady who found sexual gratification in this manner.

[212] Dr. J.G.  Kiernan, to whom I am indebted for a note on this point, calls my attention also to the case of a homosexual and masochistic man (Medical Record, vol. xix) whose feelings were intensified by tight-lacing.

[213] Some women are also able to produce the orgasm, when in a state of sexual excitement, by placing a cushion between the knees and pressing the thighs firmly together.

[214] Lecons sur les Deformations Vulvaires, p. 64.  Martineau was informed by a dressmaker that it is very frequent in workrooms and can usually be done without attracting attention.  An ironer informed him that while standing at her work, she crossed her legs, slightly bending the trunk forward and supporting herself on the table by the hands; then a few movements of contraction of the adductor muscles of the thigh would suffice to produce the orgasm.

[215] C.W.  Townsend, “Thigh-friction in Children under one Year,” Annual Meeting of the American Pediatric Society, Montreal, 1896.  Five cases are recorded by this writer, all in female infants.

[216] Soutzo, Archives de Neurologie, February, 1903, p. 167.

[217] Zache, Zeitschrift fuer Ethnologie, 1899, p. 72.  I have discussed what may be regarded as the normally sexual influence of dancing, in the third volume of these Studies, “The Analysis of the Sexual Impulse.”