Not specifically. There are some people who are into BDSM who also have a foot fetish. There are people into BDSM who do not. And there are people who have a foot fetish who aren't interested in BDSM in the slightest.
So one is not "a part" of the other, but they aren't mutually exclusive concepts either.
yep lily covered it i figure.
really this is like asking if oranges are a part of cooking- it all depends on what you're wanting to make. *smile*
What the caterpillar calls the end of the world, the Master calls a butterfly ~ Richard Bach