As far as this world and its problems are concerned, however—and who, if you please, stands outside this world and its problems?—we have to deal with one kind of life only—Mortal Life. As I have shown, the necessary correlative of Mortal Life, if it is to continue, is Sex. We are concerned, therefore, immediately and directly, with Mortal Life, and its indispensable correlative Sex. We need not accept the scheme as it is thus unceremoniously thrust upon us. We can deny Mortal Life and its concomitant need, Sex, by putting an end to everything at least for ourselves, through straightway committing suicide the very moment we realize that Mortal Life and Sex are undesirable. If, however, we accept the proposition, “Mortal Life is desirable,” we necessarily commit ourselves to the rider, “Sex is desirable.” These features are all we know concerning Life; they constitute the two sides of the only kind of Life of which we are aware, and however real and realistic our visions of an Eternal Life may be, however vivid our mental pictures of a Heaven may seem, such visions and such mental pictures, as we very well know, are of a kind the true existence of which is quite incapable of proof or demonstration; whereas Mortal Life is here before us, with us and in us, and the way to live it is our chief concern; the way to live it well so that it may redound to the benefit and credit of all, is our highest concern. Throughout this book, I shall argue on the assumption that the reader, like myself, believes that mortal life is desirable. I shall take it for granted that he, like me, is content to allow transcendental questions to weigh with him only in so far as they do not render him hostile to Mortal Life. I shall therefore assume all along that he believes, as I do, that Sex is desirable, however far the consequences of such an admission may lead him. Be this as it may, let him entertain no qualms as to the direction in which I wish these consequences to lead him. There are more than two alternatives in the choice of one’s attitude to Sex. To most people there appear to be but two opposite extremes: the attitude of the lecherous reprobate who makes decent women ashamed of being women; and the attitude of the Puritan who, in his heart of hearts, feels that if only he could have been at the Almighty’s elbow at the time of the Creation, he would have respectfully suggested a somewhat more “drawing-room” method of propagating the species.