When you know that a provider also provides domme/fetish services? I resemble that description and sometimes have guys either tell me that they are intimidated by this or ask half jokingly after they make an appointment "you're not going to try to stick anything in my ass are you?". The answer to that is of course not, unless that's what floats your boat. If a gentleman contacts me for a session and does not indicate that a BDSM session is what he's coming for I won't introduce any aspect of it unless he asks.
FTR, strap on play is only one of the many aspects of BDSM, but that is for another thread. For all intent and purposes for this this thread, here is a rough description of terms for those that may not be familiar. Links: What is BDSM? What are fetishes?
Some providers, as most people are in general, are multifaceted. I have the sweet, soft, and romantic side to me, and then there is my extra kinky twin. At times, I can be both. Catering to all sides of our sexuality is what I enjoy most about this hobby of ours.
So back to my original question: Does knowing a provider's other sexual interests that may be considered outside of the realm of vanilla have a bearing on how you perceive they will be BCD?