Excerpt: 'Sexuality is the most powerful factor in individual and social existence; the strongest incentive to the exertion of strength and acquisition of property, to the foundation of a home, and to the awakening of altruistic feelings, first for a person of the opposite sex, then for the offspring, and, in a wider sense, for all humanity. Thus all ethics and, perhaps, a good part of æsthetics and religion depend upon the existence of sexual feeling. Though the sexual life leads to the highes ...