In human sexuality, kink describes a range of practices: spanking, tickling, bondage, dominance and submission, sadomasochism (BDSM), cuckoldry and sexual fetishism. Kinky 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. While others define "kink" as lesser (possibly socially acceptable) form of fetishism. 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. Practitioners are sometimes considered to be perverts by "outsiders".