"Sex-Education: A Series of Lectures Concerning Knowledge of Sex in Its Relation to Human Life" by Maurice Alpheus Bigelow is a pioneering work in the field of sex education. Published in 1916, this book is notable for its comprehensive and progressive approach to discussing sexuality and sexual health. Bigelow, an American physician and educator, wrote "Sex-Education" at a time when discussions about sex were often considered taboo or restricted to medical professionals. The book consists of a series of lectures that aim to provide readers with a thorough understanding of human sexuality, covering topics such as anatomy, physiology, reproductive health, sexual development, and interpersonal relationships. One of the key objectives of the book is to promote sexual health and well-being by dispelling myths, addressing common concerns, and providing accurate information about sexual anatomy and function. Bigelow emphasizes the importance of education in promoting healthy attitudes towards sex and relationships, advocating for open and honest communication between partners and between parents and children. "Sex-Education" reflects the progressive attitudes of its time, challenging traditional beliefs and advocating for a more enlightened approach to sexuality. While some of the terminology and scientific understanding may be outdated by modern standards, the book remains significant for its contributions to the field of sex education and its commitment to promoting sexual health and understanding.