I found something I agree with...

...To call submission a gift means to give it, no strings attached, with no expectation of getting something in return. Let's face it: almost no one does this. Submission therefore is not a gift, but a commodity. That doesn't in any way make it bad, or cheap, or less "romantic". We offer submission expecting to get dominance in return.

So it's not giving a gift, but establishing a symbiotic relationship where each feeds from the other.

from the book Conquer Me by Kacie Cunningham