1. When talking on campus, both boys and girls choose remote, unlit and sparsely populated places: behind the library building, around the playground, in dark corners of corridors, etc.

During the conversation, boys and girls have physical contact, such as holding hands, hugging, patting each other, climbing back, kissing and so on.

Boys and girls are walking in pairs on campus, or fighting in full view.

4. Men and women are too casual when communicating, such as chasing and slapping, pushing and shoving, leaning on the opposite sex students, sitting, touching their heads, touching their faces or casually calling couples.

Boys and girls eat in pairs in the school canteen or other places, or whisper in the dining place.

6 Enter or stay in the opposite sex dormitory.

7. Valentine's Day and Singles' Day, the opposite sex exchange gifts.

8. Boys and girls go out to play and stay together.