It varies from person to person and from occasion to occasion. Campus is different from home and even hotels, but today's young people are very precocious and should be fine. Generally speaking, there are three situations. One was a simple kiss, so I was nervous and my heart beat so hard that I forgot what happened. Second, there will be some involuntary movements on the hands, touching and hugging each other. The third is someone with some experience, kissing and then. . . Not suitable for children.