Admitting defeat? Oh no.
I'm basically saying that I can free her while you can not, because you're not the reason she is trapped.
How would you free her though in ways she has not already thought about herself?
BDSM is a part of sex, sex is an art on its own, BDSM is a form of sex and a part of it.
BDSM is a subversion of sex that spans in many directions. To be a master of sex is not the same as being a master of the specificities within BDSM. A master of BDSM would be a master of sex, but a master of sex is likely not going to be a master of BDSM.
BDSM is about how they need specific things to enjoy themselves, you can't please them as a generalist.
Claiming that I have knowledge over sex but not BDSM, doesn't negate that I might be superior to you in causing pleasure, just that you're better at one of these ways.
I can allow pleasure specifically within the range I'm specialized in.