Bloch concludes that “in most cases the sexual coldness of women is in fact only apparent, either due to the concealment of glowing sexuality beneath the veil of outward reticence prescribed by conventional morality, or else to the husband who has not succeeded in arousing erotic sensations which are complicated and with difficulty awakened....  The sexual sensibility of women is certainly different from that of men, but in strength it is at least as great.” (Iwan Bloch, Das Sexualleben unserer Zeit 1907, ch. v.)

Nystroem, also, after devoting a chapter to the discussion of the causes of sexual coldness in women, concludes:  “My conviction, founded on experience, is, that only a small number of women would be without sexual feeling if sound views and teaching prevailed in respect to the sexual life, if due weight were given to inner devotion and tender caresses as the preliminaries of love in marriage, and if couples who wish to avoid pregnancy would adopt sensible preventive methods instead of coitus interruptus.” (A.  Nystroem, Das Geschlichtsleben und seine Gesetze, eighth edition, 1907, p. 177.)

We thus find two opinions widely current:  one, of world-wide existence and almost universally accepted in those ages and centers in which life is lived most nakedly, according to which the sexual impulse is stronger in women than in men; another, now widely prevalent in many countries, according to which the sexual instinct is distinctly weaker in women, if, indeed, it may not be regarded as normally absent altogether.  A third view is possible:  it may be held that there is no difference at all.  This view, formerly not very widely held, is that of the French physiologist, Beaunis, as it is of Winckel; while Rohleder, who formerly held that sexual feeling tends to be defective in women, now believes that men and women are equal in sexual impulse.

At an earlier period, however, Donatus (De Medica Historia Mirabili, 1613, lib. iv, cap. xvii) held the same view, and remarked that sometimes men and sometimes women are the more salacious, varying with the individual.  Roubaud (De l’Impuissance, 1855, p. 38) stated that the question is so difficult as to be insoluble.

In dealing with the characteristics of the sexual impulse in women, it will be seen, we have to consider the prevalence in them of what is commonly termed (in its slightest forms) frigidity or hyphedonia, and (in more complete form) sexual anesthesia or anaphrodism, or erotic blindness, or anhedonia.[157]

Many modern writers have referred to the prevalence of frigidity among women.  Shufeldt believes (Pacific Medical Journal, Nov., 1907) that 75 per cent, of married women in New York are afflicted with sexual frigidity, and that it is on the increase; it is rare, however, he adds, among Jewish women.  Hegar gives 50 per cent, as the proportion of sexually anesthetic women;