Most men who are submissive in the bedroom are very powerful men in most other aspects. I find that combination irresistible. I don't mean just in BDSM. I like it that they are so powerful yet they let you lead the way. They want to relax and let you take over.
On the flip side, a naturally dominant manly man can have me acting so submissive in the bedroom that I'll be putty in his hands.
Trying to domme a dominant guy is just silly and awkward!