1) BDSM literature 
Sadopaideia: Being the Experiences of Cecil Prendergast Undergraduate of the University of Oxford Shewing How he was Led Through the Pleasant Paths of Masochism to the Supreme joys of Sadism is a pornographic novel published in 1907 by `Ashantee of Edinburgh`: probably Charles Carrington in Paris. It was later published in the United States by G.....