A man who has led a continent life before marriage should have no difficulty in controlling his sexual appetite to that extent. If the sexual intercourse occurs as infrequently as once or twice in a month, the man, by living thus continently, will find it much more easy to maintain his continence during the twelve-month period after his wife becomes pregnant before he can properly have intercourse with her again, than would be the case if he had had sexual relations much more frequently. That the man desires intercourse much more frequently than as above outlined and that the woman, in the vast majority of cases, does not desire intercourse except for procreation and about as frequently as above indicated is, without any reasonable doubt, due to hereditary tendencies. Under primeval conditions, and in fact, until comparatively recent times, the vast majority of mankind were polygamous, the strong men of the race--those who procreated their kind--having as many wives as they could support and protect, the weak men of the race being crowded aside, sometimes castrated, to become the burden bearers for the strong. Under conditions of polygamy the woman is rarely subjected to sexual intercourse for other than procreative purposes, and even granting that the man has intercourse for procreation only, if he had twelve wives, he would be having it twelve times as frequently as any one of them. That these experiences on the part of a long line of maternal ancestors should lead the women of today to desire sexual intercourse for procreation only, is easy to understand; that the impulses transmitted along the paternal line of ancestors should lead the men of today to desire intercourse far more frequently than this can, under monogamous conditions be indulged, is also easy to understand. 8. _How frequently may sexual intercourse be indulged, in the marriage state?_ If one is to overstep the bounds mentioned above, i.e., to indulge in sexual intercourse once or twice in a month for procreation only and not at all during the period of pregnancy and childbed period, the limit is then set, not by strictly normal and anthropological considerations, but by the health of the individuals. The author has seen young married couples who had carried their sexual intercourse to such extremes as seriously to deplete the physical vigor and menace the health of both parties. Just how frequent indulgence will have this effect in any particular case is impossible to say. In some cases twice a week may have this effect; in other cases once in twenty-four hours might be borne for a considerable time. In any case the condition is an unnatural one and is certain to bring a natural retribution in some form--either broken health, or sterility of the wife, and depleted powers of the husband, or weak and sickly children, separated by long intervals. 9. _How long is it possible for a young man to waste his vital fluid and yet be able to raise healthy children?_