Gregor A. Gregorius (Eugen Grosche) was a German bookseller, writer, psychotherapist, and occultist. Gregorius founded the then well-known bookstore Inveha," and the famous Fraternitas Saturni in Berlin, Germany in the 1920's until it was prohibited by the National Socialists in 1936.This little book is part of a series of study guides that Gregorius has written during the post-World War I period called the Weimar Republic. These days, the 1920s, proved to be a very fertile ground for diverse lodges and occult and magic teachings, especially in a large cultural center as Berlin.In this book, Gregorius conveys his vision of new modern sexuality and a replacement of old prudery and subscribes a sexual openness in a society that was quite ahead of its time.In the second part, Gregorius delineates the philosophy of sexual magic and its practice. Many of Gregorius' concepts of magic echo the true hermetic thought of Franz Bardon's system.