S is a sadist: it refers to a medieval French marquis named sadist, who likes to abuse women in his life. There are a lot of descriptions of sexual perversion in his works, so later scholars named him active sadomasochism, that is, he likes to abuse others and sadomasochism, that is, sadism.
M refers to masochism:19th century Austrian novelist Massock himself is a passive sadist and describes many abnormal sexual activities in his works. Therefore, passive sadism is named Massock phenomenon, namely masochism.
In China, sm also belongs to a subculture. Tied, masked, spanked, etc. As a supplement to ordinary sex, most people can accept it, and the media also reported it.
A concept to be mentioned here is "Cyber SM", that is, network SM. Like sexual fantasy, this way of getting sexual pleasure through fantasy SM scenes is called network SM. The development of instant messaging also provides a broad platform for network short messages. Tencent QQ, as the largest IM service provider in China, is a common tool for SM lovers to communicate online. The QQ chat room "Slave Society" is a good platform for SM communication. In addition, there are many QQ groups, where S and M can communicate with each other, get to know each other and move from the network to reality.