Teen-agers slip their hands down one another's waistbands. Hips grind together. Guys lie on the floor with girls straddling them. Teen-agers slip their hands down one another's waistbands.
Hips grind together.
Guys lie on the floor with girls straddling them. School officials say it's sex with clothes on. Some schools have canceled all dances except the prom. Others have issued strict rules. One school required students to pass a quiz about dance-floor behavior before allowing them to attend a dance.