BDSM = Bondage Discipline Sado Masochism.
Google it you dare.... But be warned.... some very very sick and strange stuff.
http://en.wikipedia.org/wiki/BDSM
Below a link to a Blog post of mine regarding a death from such sex....you gotta scroll down a bit under the cartoon sign about “beware of children”.
http://patfish.blogspot.com/2007/10/true-crime-he-died-during-sexual.html