A collection of essays integrates medical, moral, and social perspectives on human sexuality, public health, and social policy. It argues that sexual behavior is shaped by mental and moral dimensions distinct from animal instinct, discusses medical responsibilities and legal frameworks for controlling contagious diseases, examines rescue and prevention work addressing prostitution and disease, critiques economic practices that commodify women, and advocates moral education for youth. Across historical examples and practical proposals, the essays blend physiological observation with social reform aims, emphasising education, ethical guidance, and policy change to protect individual well-being and public health.