Ok, if we chose to accept that defintion then there's another problem. A person can be very knowledgable about "BDSM-theory" but still haven't a clue what they themselves are into. And then there's a lot of, what I would define as "BDSM-nerds" who know "everything". It's just that people who've developed as Doms, (or subs) completly outside the BDSM scene, just like me have problems relating to some of the commonly accepted truths.