i just don't know

Today I had patio duty, which is kind of like recess duty, but my school is basically outside and students congregate during breaks in front of the cafeteria. I had to watch the secondary students to make sure there were no problems. There were several groups of students gathered, and many groups were co-ed. Teenagers are teenagers, regardless of the country, and so there was a lot of physical contact happening. As I watched these boy/girl interactions, I wondered: in a country where everyone kisses everyone, where do we draw the line on PDA* in the school? What is considered cultural, and what is just too far?

*Public Displays of Affection