Why wait till Marriage Author:Evelyn Millis Duvall EVELYN MILLIS DUVALL is best known to more than a million American young men and woman for the guidance she has given them in her "Facts of life and love for teen-agers", recently replaced by the fully updated "Love and the facts of life". Young people also know her book, "The art of Dating", written with her daughter, Joy Duvall Johnson....