In human sexuality, kinkiness or kinky (adjective), is a colloquial term used to describe unconventional sexual concepts or practices. The term derives from the idea of a "bend" (cf. a "kink") in one's sexual behaviour, to contrast such behaviour with "straight" or "narrow" sexual mores and proclivities. The term "kink" has been claimed by some who practice sexual fetishism as a term or synonym for their practices, indicating a range of sexual and sexualistic practices from playful to objectifying and paraphilic.
Kink sexual practices go beyond what are considered conventional sexual practices as a means of heightening the intimacy between sexual partners. Some draw a distinction between "kink" and "fetishism", defining the former as enhancing partner intimacy, and the latter as replacing it. Because of its relation to "normal" sexual boundaries, which themselves vary by time and place, the definition of what is and is not kink varies widely as well.