There are many other methods of preventing impregnation, some of which are even more pernicious in their consequences, advertised by unscrupulous, and made use of by silly, persons; but, save in the one possible exception noted, all are inefficacious, and injurious in their results. There is, however, one absolute remedy—the refraining from the sexual act; not so difficult after all, either, to the educated man, sensible of the physiological fact that sexual connection is primarily God's law for the propagation of the race, and not a mere agency of sensual pleasure; and fully conscious of the further fact that, had God intended it for man's gratification alone, His wisdom would undoubtedly have provided some means by which that gratification might have been secured without the danger of impregnation. The knowledge of these facts, together with the equally vital one, that intelligent sexual relations are founded, like every other act of life, on intelligent moral perceptions, ought to make such a duty both plain and practicable; and although a distinction is easily drawn between duties which rest on the dictates of conscience and those based on positive commands, the sin of unrestricted intercourse, to such a man, will appear not the less a sin because there is no Scriptural, legal, nor social injunction against it.