The "G-spot" concept was named by Addiego and others in 1981 or by Beverly Whipple and others in 1982. It is named after the German gynaecologist, Ernst Gräfenberg. Gräfenberg wrote first about "The Role of Urethra in Female Orgasm" in 1950. A book was first published about the G-spot in 1982, called "The G Spot and Other Recent Discoveries About Human Sexuality", by three authors from the United States: Alice Kahn Ladas, a psychologist; Beverly Whipple, a registered nurse and sex counselor; and John D. Perry, a psychologist.