Letamendi, of Madrid, has suggested "auto-erastia" to cover what is probably much the same field. In the beginning of the nineteenth century, Hufeland, in his Makrobiotic, invented the term "geistige Onanie," to express the filling and heating of the imagination with voluptuous images, without unchastity of body; and in 1844, Kaan, in his Psychopathia Sexualis, used, but did not invent, the term "onania psychica." Gustav Jaeger, in his Entdeckung der Seele, proposed "monosexual idiosyncrasy," to indicate the most animal forms of masturbation taking place without any correlative imaginative element, a condition illustrated by cases given in Moll's Untersuchungen über die Libido Sexualis, Bd. I, pp. 13 et seq. Dr. Laupts (a pseudonym for the accomplished psychologist, Dr. Saint-Paul) uses the term autophilie, for solitary vice. (Perversion et Perversité Sexuelles, 1896, p. 337.) But all these terms only cover a portion of the field.
H. Northcote, Christianity and Sex Problems, p. 231.
Rosse observed two elephants procuring erection by entwining their proboscides, the act being completed by one elephant opening his mouth and allowing the other to tickle the roof of it. (I. Rosse, Virginia Medical Monthly, October, 1892.)