The long-taboo subject of consensual BDSM (bondage/discipline, dominance/submission, sadomasochism) is coming "out of the closet" - much to the delight of the millions of adults who enjoy engaging in bondage, spanking, erotic role-playing and similar consensual practices. Jay Wiseman's SM 101 has taught the fundamentals of safe, exciting SM to tens of thousands of people of all genders and orientations.