sexual inversion

English edit

sexual inversion (uncountable)

(dated) Homosexuality, as regarded by a theory of the late 19th and early 20th century that saw it as an inborn reversal of gender traits. [from 19th c.]
- 1901, Henry Havelock Ellis, Sexual Inversion (Studies in the Psychology of Sex), Philadelphia: F. A. Davies, page 1:
  Congenital sexual inversion—that is to say, sexual instinct turned by inborn constitutional abnormality toward persons of the same sex—is a comparatively rare phenomenon, so far as our knowledge at present extends.