Do authors chose names that begin with S&M because their stories include spanking? Examples, Smiley Smith (double S&M) and SmokinDriver. There might be an anagram of D/s (domination and submission) in the latter names capital letters.
One of the tags is Light Bondage. I wonder what dark bondage would involve. Or is the subject tied with thread or cord rather than rope or metal bonds?
There are more than a few pen-names that include the name "dragon" often with a color as a prefix. Could it be their stories drag on?