"S&M" is a song by Barbadian recording artist Rihanna from her fifth studio album, Loud, release in 2010. Produced by Stargate and Sandy Vee, it was released on January 21, 2011 as the album's fourth US single and third international single. "S&M" is an uptempo Eurodance and dance-pop song. Critical reception of "S&M" was mixed. In April 2011, the song was re-released as a remix single to digital outlets, featuring guest vocals by American recording artist Britney Spears.