This is Harau's first night. The family always attends the first night of the person who will become the head of the family. It was for sex education. Parents watch over their children so that they do not make mistakes, and siblings learn by watching their older brothers and sisters' actions up close. Parents can easily teach, and younger siblings can learn the etiquette of their time. Kill two birds with one stone. It's a reasonable decision. …for anyone other than us. That was sex education in this country. I want to beat the guy who came up with the idea.