The actual mechanics of much of BDSM---otherwise known as S&M or leather---is well-documented in numerous how-to books, various movies, and numerous novels. It is often seen as kinky sex, and is commonly portrayed as involving skin-tight black leather clothing, chains, ropes, and nude or semi-nude participants writhing in delicious erotic ecstasy while being flogged or whipped by domineering "masters" and "mistresses". And maybe this is what it is...