Next time you have a free moment, stand outside an elementary school and watch the children play during recess. Make sure you’re not wearing a trench coat and staring for too long; otherwise, the teachers will call the police on you.
While you’re (surreptitiously) watching the children, take special note of how the little boys and girls interact. They will be flirting in the way only children do, and it will be pretty easy to spot. The boys will pick on the girls and pull their hair; the girls will scream and swat the boys away. The boys will throw soccer balls at the girls; the girls will keep the soccer balls and fold their arms together in sneers. Shins will get kicked, and cooties will be spread.