A young man with a good physical constitution belongs entirely to love, and love is the property of youth. All the energies of sentiment, all the powers of thought at that age are moulded by that sovereign affection, which absorbs and carries away everything into its hot and turbulent whirlpools. He is less than a eunuch who does not love at twenty, because even a eunuch can love, and there is an amorous sterility which has its seat in the brain and in the heart, and which is more humiliating than any mutilation of organs, than any lack of functions. If, at twenty, a man does not encounter a woman in the social world, he loves the picture or statue of a woman, he loves the heroine of a story or of a poem, and the young girl adores the angels whose wings flutter around her virginal bed. At twenty, one should possess the physical energy to love a hundred women, and even the most modest maiden finds in the air, at every step, a spark darting from her contact with a man. Notwithstanding, however, a gigantic and fruitful possibility of polygamy, man and woman are, in their robust youth, essentially monogamous, and in their most senseless idolatries they are still monotheists. One god, one temple, one religion only. One must be born with singular perversity to be polygamous from the first steps in love, and the young girl who already loves more than one man at a time must have been conceived in a bawdy-house by the kneading of the blood and the flesh of a bacchante. Yet against this virtuous, energetic, holy monogamy there rise on all sides enormous obstacles; formidable adversaries move against it from every quarter, opposing the first steps. Adam has found his Eve; Eve has seen her Adam; but in the embrace of those two lovers, how many enemies, how many barriers, how many abysses! Adam loves Eve; Eve loves Adam; what can be more simple, what affinity more intense, what affection more inevitable than their union? Still before they can embrace each other, these two unfortunate creatures must ask permission of prejudice, hypocrisy, conventionalities, hygiene, morality, religion, and above all, finance; and there is scarcely one chance out of a hundred that the answer will be a "yes" from all these superior authorities that have the right of vetoing their affection. The nightingale has seen and loved his modest companion; in the deep shadow of a mysterious alder he has sung to her his tenderest song and infused his love into her. Today they sleep, happy in their love, and tomorrow they will find flexuous branches and soft moss to weave their nest. No need of civil matrimony, of religious matrimony, of financial matrimony. But woe to the man who shall rely upon nature to have his nest prepared! The morrow of his loves would be cursed by hunger; and scrofula and rachitis would kill his children, born of a union which lacked the consent of finance.