I am currently reading Jack Stevenson's latest study Scandinavian Blue: The Erotic Cinema of Sweden and Denmark in the 1960s and 1970s (McFarland) an absorbing history and analysis of exploitation and sex movies produced in Scandinavia. The section on I Am Curious (Yellow) is exceptionally interesting as is the study of the 1974 movie The Sinful Dwarf. Recommended reading for any student of the nether regions of the true world cinema.
Also, revisiting Gary Indiana'a Salo or The One Hundred Days of Sodom (BFI) one of the best books on a single film published and absorbing reading for those interested in Pasolini's movie and / or in de Sade's writings.
A piece on Jack's book is forthcoming.