Mantegazza devoted great attention to this point in several of the works he published during fifty years, and was decidedly of the opinion that the sexual emotions are much stronger in women than in men, and that women have much more enjoyment in sexual intercourse. In his _Fisiologia del Piacere_ he supports this view, and refers to the greater complexity of the genital apparatus in women (as well as its larger surface and more protected position), to what he considers to be the keener sensibility of women generally, to the passivity of women, etc.; and he considers that sexual pleasure is rendered more seductive to women by the mystery in which it is veiled for them by modesty and our social habits. In a more recent work (_Fisiologia della Donna_, cap. viii) Mantegazza returns to this subject, and remarks that long experience, while confirming his early opinion, has modified it to the extent that he now believes that, as compared with men, the sexual emotions of women vary within far wider limits. Among men few are quite insensitive to the physical pleasures of love, while, on the other hand, few are thrown by the violence of its emotional manifestations into a state of syncope or convulsions. Among women, while some are absolutely insensitive, others (as in cases with which he was acquainted) are so violently excited by the paradise of physical love that, after the sexual embrace, they faint or fall into a cataleptic condition for several hours. "Physical sex is a larger factor in the life of the woman.... If this be true of the physical element, it is equally true of the mental element." (Dr. Elizabeth Blackwell, _The Human Element in Sex_, fifth edition, 1894, p. 47.) "In the female sex," remarks Clouston, "reproduction is a more dominant function of the organism than in the male, and has far larger, if not more intense, relationships to feeling, judgment, and volition." (Clouston, _Neuroses of Development_, 1891.) "It may be said," Marro states, "that in woman the visceral system reacts, if not with greater intensity, certainly in a more general manner, to all the impressions, having a sexual basis, which dominate the life of woman, if not as sexual emotions properly so called, as related emotions closely dependent on the reproductive instinct." (A. Marro, _La Pubertà_, 1898, p. 233.) Forel also believed (_Die Sexuelle Frage_, p. 274) that women are more erotic than men.