Bust out the whips and chains. Rihanna gets dirty on the set of “S&M,” the new single off her latest album Loud. In the behind-the-scenes footage from the Melina-directed video, RiRi, clad in pink body latex, spins around in a chair and plays naughty games with hostages before putting on a red clown wig and clutching a blow-up doll. Ow!