An 1882 text by French physician Jules Guyot, Bréviaire de l’amour expérimental (A manual of experimental love), includes a preface by Georges Barral and Charles Dufaure de la Prade that declares that it is not possible for women to opt out of sex. All women needed to participate in the “physiology of love,” for failure to do so would result in “the worst kinds of pathology,” such as hysteria.