The traditional etiquette in China is that men are left and women are right, while in the west, men are right and women are left. Why? Because, in the old society, in the era of cold weapons, robbers were rampant, and it was impossible to say when robbers with steel knives would come out to rob. The man stands on the right side of the woman, and the woman holds the man she loves with her right hand, just as the man's right hand can hold a sword to protect the woman she loves, so the custom of male right and female left has been used to this day. After the introduction of Western-style weddings in China, there was a problem in positioning. The general solution is for two people to have sex together.