Sexologist Leonore Tiefer has written a new book called "Sex Is Not a Natural Act: and Other Essays." She looks at our society's anxieties towards and ignorance about sex. She also questions what is "normal" sex. Tiefer received a Ph.D. in physiological psychology, and later specialized in clinical psychology to become a sex researcher, sex therapist and an Associate Professor at the Montefoire Medical Center in New York City. Tiefer has also been a sex columnist for the New York Daily News.