Havelock Ellis,
Love and Pain — Volume 4
(1913)
“ The idea of being chained and fettered appears to be not uncommonly associated with pleasurable sexual feelings, for I have met with numerous cases in both men and women, and it not infrequently coexists with a tendency to inversion. It often arises at a very early age, and it is of considerable interest because we cannot account for its frequency by any chance association nor by any actual experiences. It would appear to be a purely psychic fantasia founded on the elementary physical fact that restraint of emotion, like suspension, produces a heightening of emotion. ”
