OMG, Alex, another great question! Certainly you have heard the phrase, "I was looking for a job when I found this one." It means that your current position holds nothing over you and you can take a new position in life...if you had to. If I had to, I could choose sex over BDSM, but why the f*** would I put myself in the situation to have to choose?
But again, a great question! I have often wondered if I would be able to deny sex after dishing out a strong dose of discipline to my slave--just because you posed the question I feel obligated to experiment (even though she is here reading as I type!).
To answer your OP, BDSM arouses me, and at this point, I would have a diffficult time differentiating sex and BDSM.