John Philips introduces the Marquis de Sade''s highly original and thoroughly subversive depiction of human sexuality and the philosophical and political thinking that underpins it. He shows how, though Sade''s work continues to shock, it can also be seen as the logical conclusion of eighteenth-century materialism. As the only writer of his time who dared to put the body at the centre of philosophy, Sade has a unique place in the history of modern thought. Extracts are taken form the whole range of Sade''s writings, including The 120 Days of Sodom, Philosophy in the Boudoir, Juliette and his Last Will and Testament.