After 6 years of marriage Morgan was disappointed with how the marriage was working. After reading widely, she developed some relationship principles. The impact in her own life was visible, with some of her women friends asking “What happened to Charlie?” She began to teach the principles in classes. In 1973 she published "The Total Woman". The book sold more than 10 million copies and was the bestselling nonfiction book of 1974. Grounded in evangelical Christianity, it taught that "It's only when a woman surrenders her life to her husband, reveres and worships him and is willing to serve him, that she becomes really beautiful to him," and that ""A Total Woman" caters to her man's special quirks, whether it be in salads, sex or sports." It is perhaps best remembered for suggesting that wives greet their man at the front door wearing sexy outfits; suggestions included "a cowgirl or a showgirl."