Iwan Bloch was a noted author and sexologist from pre-Nazi Germany. He was a contemporary of fellow sexologist, Magnus Hirschfeld, and Sigmund Freud considered his contributions on homosexuality key to looking at sexual orientation from a non-pathological stance. I suspect it gave some level of legitimacy to Falstaff Press in the eyes of government suppression, but not much, given the fervor of the law. Although he was responsible for discovering the presumed-lost manuscript of The 120 Days of Sodom by the Marquis de Sade and he was an early biographer of the notorious figure, so who knows.
I’d like to see this book and have a good insight into pre-WWII European sexual culture.