The year was 19 72, and liberation was in the air. Alex comfert hoped that his manual would do for sex what the joy of cooking had done for food. Charlotte mc cann writes for the economist and is also the author of a short book about the history of sexuality. If you like the intelligence, please rate us on your podcast stap. And if you like the economist, sign up for economist education, six weeks on line course on business writing and story telling.