This book argues that the economic dependence of women on men, a unique condition in the human species, creates an 'excessive sex-distinction' that impedes individual and societal evolution. It critiques the 'sexuo-economic relation,' traditional marriage, motherhood, and the confinement of women to domestic and sex-functions, which leads to social ills, inefficient child-rearing, and moral imbalance. The author advocates for women's economic independence, the professionalization and socialization of domestic labor (e.g., communal kitchens, collective childcare), and a re-evaluation of family structures. This restructuring, she asserts, is crucial for purifying marriage, fostering individual development, accelerating social progress, and achieving a healthier, more equitable human society, aligning ethics with evolving social conditions.