SM 101: A Realistic Introduction. A book by Jay Wiseman
This is the perfect realistic introduction to lifestyle D/s, heavy BDSM, and/or non-heavy bedroom games. He is a very funny, often satiric, and easy to understand writer. BDSM safety is heavily stressed, as it must be. Jay also has a great knowledge of the medical and physical side of things which is not only interesting but also comforting.