David Reuben (b. 1933), U.S. psychiatrist. Everything You Always Wanted to Know About Sex, But Were Afraid to Ask (book title) (1969).
Reuben's manual became America's number-one nonfiction bestseller. Woody Allen's satirical movie of the same name was released in 1972. In the screenplay, Allen asked: "Is sex dirty? Only if it is done right."