Psychopathia Sexualis, eighth edition, pp. 8 and 11. Gannouchkine ("La Volupté, la Cruanté et la Religion," Annales Medico-Psychologique, 1901, No. 3) has further emphasized this convertibility.
E. Murisier, "Le Sentiment Religieux dans l'Extase," Revue Philosophique, November, 1898. Starbuck, again (Psychology of Religion, Chapter XXX), in a brief discussion of this point, concludes that "the sexual life, although it has left its impress on fully developed religion, seems to have originally given the psychic impulse which called out the latent possibilities of developments, rather than to have furnished the raw material out of which religion was constructed."
"Una Santa," Archivio di Psichiatria, vol. xix, pp. 438-47, 1898.
With regard to the sexual element in the worship of the Virgin, see "Ueber den Mariencultus," L. Feuerbach's Sammtliche Werke, Bd. I, 1846.