The video 'Origin of Everything: Why Do Schools Teach Sex Education?' delves into the historical evolution and controversies surrounding sex education in schools. It highlights the pivotal role of schools in providing sexual education, tracing back to the late 19th century where education on human sexuality was predominantly confined to homes and religious institutions. The video discusses significant legislative measures, such as the Chamberlain-Kahn Act, and their impact on public perception and education. It explores the balance between parental roles and educational responsibilities in delivering sex education, reflecting on the varying global approaches and the controversies that persist today. The video, referencing Jonathan Zimmerman's book 'Too Hot to Handle: A Global History of Sex Education,' provides an insightful look into the importance of informed sexual health education as part of a comprehensive schooling system, highlighting its relevance to public health, moral instruction, and societal well-being.