Kinky sex v. D/s are definitely different.

Just because we roll BD DS SM and a host of fetishes into a single label, doesn't inexorably link them in meaning.

Oral sex, anal sex, clothing fetishes, cross-dressing, obsession with pregnant women, lactation, incest, etc. etc. etc. are all practiced by non-dominants and non-submissives.

And as others have stated, the need to dominate or submit does not necessarily have to include bondage, discipline (as in impact play,) sadism nor masochism.