In this lively and engaging work, Carolyn Lewis explores how medical practitioners, especially family physicians, situated themselves as the guardians of Americans' sexual well-being during the early years of the Cold War. She argues that many doctors viewed their patients' sexual habits as more than an issue of personal health. They believed that a satisfying sexual relationship between heterosexual couples with very specific attributes and boundaries was the foundation of a successful marriage, a fundamental source of happiness in the American family, and a crucial building block of a secure nation.