Institut für Sexualwissenschaft - Wikipedia
The Institut für Sexualwissenschaft was an early private sexology research institute in Germany from 1919 to 1933. The name is variously translated as Institute for Sexual Research, Institute of Sexology, Institute for Sexology, or Institute for the Science of Sexuality. The Institute was a non-profit foundation situated in Tiergarten, Berlin. It was the first sexology research center in the world
The institute aimed to educate both the general public and specialists on its topics of focus.[6] It became a point of scientific and research interest for many scientists of sexuality, as well as intellectuals and reformers from all over the world.[20][11] Visitors included René Crevel, Christopher Isherwood, Harry Benjamin, Édouard Bourdet, Margaret Sanger, Francis Turville-Petre, André Gide and Jawaharlal Nehru.[11][20][17]
https://www.scientificamerican.com/article/the-forgotten-history-of-the-worlds-first-trans-clinic/
(met Karl Geise while he was a student)
The institute would ultimately house an immense library on sexuality, gathered over many years and including rare books and diagrams and protocols for male-to-female (MTF) surgical transition. In addition to psychiatrists for therapy, he had hired Ludwig Levy-Lenz, a gynecologist. Together, with surgeon Erwin Gohrbandt, they performed male-to-female surgery called Genitalumwandlung—literally, “transformation of genitals.” This occurred in stages: castration, penectomy and vaginoplasty.
https://www.theoccidentalobserver.net/2021/07/18/magnus-hirschfelds-racism-1934/