S&M means Sado-Masochism also known as Slave and Master. It is a sub division of the BDSM scene. BDSM is divided into three parts, BD stands for Bondage Domination, DS for Domination Submission and SM for Sadist Masochist. This is a very small community that derives its pleasure from fetishist objects and ideas… If you want to know more, go onto to google and try BDSM or just SM to know more about the scene. I can assure you for a fact, Rihanna is definitely not a S&M person. She is just misusing the look for her own personal gain. She is too vanilla, a word used to describe people not of the fetish/leather community.