body modification

Body modification (or body alteration) is the permanent or semi-permanent deliberate altering of the human body for non-medical reasons, such as spiritual, various social (markings), BDSM "edgeplay" or aesthetic. It can range from the socially acceptable decoration (e.g., pierced ears in many societies), to the overtly religiously mandated (e.g., circumcision in a number of cultures) to corporal punishment, to provocative statement by the rebellious (e.g., tongue splitting). Some even become physically addicted to the adrenaline/endorphin release associated with a painful procedure in a way analogous to that experienced by those who self-harm. Some people experience an abstract but distinct compulsion to modify their body that appears to have no underlying or external reason.
See more at Wikipedia.org...