Ernst Gräfenberg was a German-born physician known for developing the first ring intrauterine device (IUD) made of silver filaments and his role for studying the role of the woman's urethra in orgasm, later coined as the G-Spot. His research also included adrenal gland cancer of the vulva and female physiology of egg implantation.
During Nazi Germany, because he was Jewish, Gräfenberg was arrested and incarcerated at Brandenburg Görden prison. He was later released with the help from American birth control activist, Margaret Sanger. He eventually arrived in the United States and opened a practice in New York City.
In 1950, Gräfenberg noted effortlessly finding the sensitive area inside the vagina near the urethra, "An erotic zone always could be demonstrated on the anterior wall of the vagina along the course of the urethra." Although not necessarily a particular spot, the term "G-Spot" was used by researchers in the 1980s.