“Part of it, of course, is simple curiosity in bondage and sadomasochistic sexuality (BDSM). That part is simple to explain: The pain and fear that comes with sadomasochistic sex causes the brain to shunt blood flow away from its executive “decision-making” areas (frontal cortex), which results in an altered state of consciousness in both the giver and the receiver. Like autoerotic asphyxiation or cocaine, experiencing fear and pain can heighten sexual gratification, but at some cost…”