Let's have a look at the dictionary definition of "passion".
Main Entry: pas·sion
Pronunciation: 'pa-sh&n
Function: noun
: intense, driving, or overpowering feeling or emotion; especially : any violent or intense emotion that prevents reflection
Hmm, I think I'll pass on this one. Without reflection? No thanks, no passion for me at all!!! Passion does NOT belong into BDSM. In lovemaking anytime, but not in BDSM.