William James, The Principles of Psychology, Volume 2…
“ The facts are just the reverse: the sexual instinct is particularly liable to be checked and modified by slight differences in the individual stimulus, by the inward condition of the agent himself, by habits once acquired, and by the antagonism of contrary impulses operating on the mind. One of these is the ordinary shyness recently described; another is what might be called the anti-sexual instinct, the instinct of personal isolation, the actual repulsiveness to us of the idea of intimate contact [Pg 438] with most of the persons we meet, especially those of our own sex. ”
