Virginia E. Johnson, a writer, researcher and sex therapist who with her longtime collaborator, William H. Masters, helped make the frank discussion of sex in postwar America possible if not downright acceptable, died on Wednesday in St. Louis. She was 88. Her son, Scott Johnson, confirmed the death, The Associated Press reported. Dr. Masters was a gynecologist on the faculty of the Washington University School of Medicine in St. Louis when he began his research into human sexuality in the mid-1950s. Ms. Johnson, who joined him in 1957 after answering an advertisement for an assistant, worked alongside him for more...