Margaret Sanger ransomed him from Nazi prison, and he was finally allowed to leave in 1940, whereupon he went to the US and opened a practice in New York City.
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Ernst Gräfenberg (September 26, 1881 in Adelebsen near Göttingen, Germany – 28 October 1957 in New York City, United States) was a German-born physician (medical doctor) and scientist.
Ernst Gräfenberg was famous for his studies of female genitalia and human female sexual physiology; he published, among other studies, the seminal The Role of Urethra in Female Orgasm (1950), which describes female ejaculation, as well as an erogenous zone where the urethra is closest to the vaginal wall.
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Dr. Ernst Gräfenberg, another German physician after whom the G-spot is named, created the first Ring IUD, Gräfenberg's ring, made of silver filaments.