The term CBT stands for Cock and Ball Torture, i.e. the torture of a man's penis and testicles. This type of play is clearly associated with BDSM and
The term sadomasochism is mainly used by the media and is hardly represented in the BDSM scene. This is partly due to the rather negative connotation of the word, but also because sadism and masochism are only a small variation of BDSM.