I don't know if BDSM qualifies as a sub culture (although there is an almost clever pun in there).
As a group we are still socially and in some cases legally frowned upon by "normal" society.
To people on the outside, we probably all resemble each other, but inside the culture (to use your term) we are as varied as any other cultural group.
We do tend to use terms like "the community" or "the scene" to differentiate our selves from "vanillas" (another term).
We don't laugh alike, nor walk alike, but at times we talk alike. (what a crazy pair).
Dunno if that qualifies as a subculture for your purposes.
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abusus non tollit usum - A right should NOT be withheld from people on the basis that some tend to abuse that right.
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