Havelock Ellis, Sexology, and Sexual Selection in Post-Darwinian Evolutionary Biology

This study situates Henry Havelock Ellis's sexological research within the nineteenth-century evolutionary debates, especially the discussion over sexual selection's applicability to humanity. For example, Ellis's monograph on sexual behavior, Sexual Inversion (1897), treated inborn homosexuality as a natural variation of evolutionary mechanisms. This book was situated within a longer study of human sexuality in relation to evolutionary selection. His later works dealt even more directly with Charles Darwin's concept of selection, such as Sexual Selection in Man (1905). Through Sexual Selection in Man, Ellis asserted that sexual attraction stemmed from a physical cause rather than an innate aesthetic sense. I argue that Ellis's best-known historical publications, including his work on sexual inversion, were intended to intervene in the contemporary evolutionary debates. This analysis also identifies a specific point where evolutionary theory informed the foundation of sexology as a scientific discipline.