Sex and Character by Otto Weininger. Published by Sphynx, Moscow, 1910. Fourth edition. Custom-made hardcover with preserved original cover. Otto Weininger, 1880 to 1903, was an Austrian philosopher who in 1903 published the book Geschlecht und Charakter, Sex and Character, which gained popularity after his suicide at the age of 23. Parts of his work were adapted for use by the Nazi regime. Antiquarian Librarian Books Publications For Collectors.