When the conjugal act is repeated too often, the man will become gradually conscious of diminished strength, diminished nerve force, and diminished mental powers. Excess weakens a man's energies, and enervates and effeminates him. Moreover, it renders him liable to an infinity of diseases and a readier victim to death. Not only is the strength of the constitution lowered by the excessive expenditure of force and matter requisite for the perpetuation of the species, but this lowered standard of vitality is transmitted to children. There can be but little doubt that this is one of the reasons why so many healthy parents beget sickly children, who die early. They have exhausted themselves of the material from which a new life is created, and so it is not properly started at the beginning and never reaches its highest development. To the truth of this statement attests the mental imbecility, the pallid and attenuated forms, of the children who are the earlier products of marriage. The effect of excessive coitus in women is seen by the confirmed ill health of so many women after marriage and repeated child-bearing. A large number of these cases are dependent upon alteration and diseases of the genitalia; but a considerable number are unconnected with local disease, and in many other cases the health is never regained after all local phenomena have disappeared. Sexual excitement in the woman causes certain congestion of the genital organs; and at the time of the orgasm there is a reflex movement which corresponds to erection, and which consists of a peristaltic movement of the tubes and uterus; to the uterus also is ascribed an act of suction by which the spermatozoa are drawn up into its interior. Even when pregnancy does not follow, the too frequent excitation and activity of the uterus in weak constitutions causes illness, first of the genital organs and then of the nervous system.