Knowledge of Chinese Studies: What are the etiquette and customs of ancient communication?

There is a passage in Mencius Li Lou: Chunyu Kun said, "Do men and women give and receive kisses?" Mencius said, "courtesy is also." Chunyu Kun said, "If my sister-in-law is drowned, how about helping her?" Mencius said, "The drowning of a sister-in-law is a jackal. Men and women don't kiss, and the ceremony is also. " Sister-in-law drowned. It was right to save her. "

"Men and women don't kiss" is an ancient communication custom, which means that both men and women should abide by etiquette in communication occasions, and it is disrespectful and not serious to do any indecent behavior.