The world of feminine crime, in so far as it is not allied to prostitution, is regarded by Lombroso as constituted only to a very slight extent of true criminal natures: “A small group of women, marked with very severe stigmata of degeneration, almost more numerous than such stigmata are in male criminal types, is sharply distinguished from the great majority of women criminals, who exhibit few and uncertain stigmata of degeneration; similarly, from the psychological standpoint, we have to distinguish from the great mass of female criminals a small group of women in whom we recognize more severe and more unnatural moral anomalies than are met with in male criminals. The ordinary woman criminal has usually been lured to crime, either by hetero-suggestion or by very powerful temptation, and her moral sense will often be found to be unimpaired, or, at any rate, not entirely destroyed.” In other words, women criminals—who in civilized countries are only from one-fifth to one-tenth as numerous as men criminals[19]—are, as a rule, criminals by passion or occasional criminals. A woman of the genuinely criminal type is either at the same time a prostitute as well as a criminal, or else—if her social position has saved her from becoming a professional prostitute—she exhibits a marked anthropological and psychological similarity to a prostitute. By reference to a large number of cases personally examined by himself, and with the aid of extensive statistical material, Lombroso endeavours to establish the thesis that, as a general rule, female delinquents come under the ban of the penal law, either from affective causes (criminals by passion) or else from the pressure of unfavourable economic circumstances or other external conditions (occasional criminals); that their offences are for the most part the outcome of a normal feminine psychical life, and are in no respect the product of emotional or moral abnormality; that alike in the general conduct of their life and in the particular offences for which they have been condemned we can trace the characteristic lineaments of the womanly nature; that above all, in the majority of them, the mother-sense is in no way diminished, or if diminished, only to a very trifling degree, and that an increase of the sexual impulse is in them hardly ever demonstrable. He then goes on to prove, by the examination of an extensive material, which he has subjected to a most careful analysis, that prostitutes and genuinely criminal feminine types (“rea nata”) are characterized by an utter lack of the mother-sense; that in women condemned for major crimes an increased sexual impulse is almost invariably present, and that this fact notably contributes to their criminal development; whereas prostitutes are, as a rule, conspicuous for sexual frigidity, and from childhood onwards are characterized by a lack of the sense of shame.