Ernst Gräfenberg Ernst Gräfenberg 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. He is known for developing the intrauterine device (IUD), and for his studies of the role of the woman's urethra in orgasm. The G-spot is named after him. Gräfenberg studied medicine in Göttingen and Munich, earning his doctorate on 10 March 1905. He began working as a doctor of ophthalmology at the university of Würzburg, but then moved to the Department of Obstetrics and Gynaecology at the University of Kiel,
Ernst Oppler Ernst Oppler Ernst Oppler (9 September 1867 1 March 1929) was a German Impressionist painter and etcher born in Hanover. Ernst Oppler was the son of (1831, Oels () 1880), a prominent German-Jewish architect. Ernst Oppler's brother was the sculptor (1869, Hannover 1937), the physician (1871, Hannover 1943), and the attorney and notary Siegmund Oppler (1873, Hannover 1942, Hannover). His cousin was the designer (1875, Nürnberg 1965, Überlingen am Bodensee). He studied at the Academy of Arts in Munich under Nikolaus Gysis and Ludwig von Löfftz. Afterwards he moved to London to study the work of James Abbott McNeill Whistler,