In man, rich in so many physical elements, the beautiful does not end with the exterior form, nor should love spring from the source of voluptuousness alone. No deformity, no disease in him who would procreate men: this is hygiene; but the hundred forms of moral and intellectual beauty, relieved only by a soft shade of sex, can and should awaken ardent and tenacious passions that do not vanish with the sun of youth. Thus, while love can dispense its delights to every man and every woman, perfect love should be born of the contemplation and adoration of every type of beauty; and when that of the form begins to fade, let moral beauty shine in all its power, and, later still, let the beauty of thought appear to us in all its brilliant majesty, so that while one star disappears, another twinkles, and from the slumbering desires of the senses we feel a stronger yearning awaken, the yearning for possessing the treasures of sentiment and thought of a creature who is all ours, and whom, if we suddenly loved her for the beauty of form, we now love and will continue to love for her beauty of kindness, culture, ideas, and everything that a human being can boast of beauty and greatness. Even character and thought have a profoundly sexual type, and feminine kindness can be adored by us, just as virile courage is admired by the sweet and tender nature of woman. When we have loved in a woman not only the beautiful female, but a whole nature imbued with all the beauties and graces of the human Eve, the longest life will not suffice to satisfy our desires of possession, and at the last hour of extreme old age we have still some new conquest to make, and some desire is reawakened, while the accumulation of most sweet memories fills the void which youth, by fleeing, has left behind itself. Sublime triumph of human nature, in which love survives the senses exhausted, voluptuousness which is mute, the beauty of forms which is buried, while a warm ray of light shines on the silvery heads of two old beings who still love each other because they still desire each other and because heart and mind unite in an embrace, sexual by origin, but ideal for the heights attained. Our study on love in old age will complete this picture, certainly one of the most beautiful and seductive in the great museum of love: a picture which we should all desire to represent in the late years of our life.