_Hegar_ concludes that strict moderation and even absolute continence in sexual matters are often, and for long periods of time, a pressing duty. “The numerous and various disasters which are brought upon the world by unbridled and unregulated sexual passion can be prevented only by enlightenment, moderation, and continence. If marriage were postponed until the attainment of complete physical maturity, in women till the age of 20, in men till the age of 25, while at the same time procreation were no longer undertaken by women above the age of 40 or by men above the age of 45 to 50 years; if, again, between successive pregnancies a sufficient pause for the woman’s recuperation were insisted upon, and intercurrent illnesses and states of debility were taken into account; and if, finally, sickly individuals, those hereditarily predisposed to disease, and those in any way below par either mentally or physically, were more than heretofore prevented from marrying; then the increase of population, which in Germany is unquestionably too rapid, would to some extent be checked. Thoroughgoing regulation of the reproductive process will not, however, be thus attained without the adoption of a method of selection too rigorous for present-day notions; and for a further advance we must in the meantime depend upon moderation and continence.” As regards the modern demand of the “right to love,” the same experienced gynecologist writes: “Whoever preaches to mankind the doctrine that ‘a man sins against his own personality if he neglects to exercise every limb he possesses, and if he denies himself the gratification of every natural impulse,’ or the doctrine that ‘it is the duty of every human being to gratify all his natural impulses, since these are most intimately inter-connected with his personality—are indeed his personality itself;’ such a preacher does harm to his kind. Such rights and such duties are chimerical for this reason if for no other, because two persons are necessary in the case of sexual gratification, and sometimes—though not as often as might be wished—Hans fails to find his Grete, without any consequent loss to society at large.”