The teenage dance craze of "freaking" – where couples rub and grind against each other – has been branded as simulated sex by school officials and has led to concern across the nation.

It cited the principal of Aliso Niguel High School in Aliso Viejo, California, who had recently banned all school dances until a plan could be found to ban "freak dancing".

The school’s principal, Charles Salter, implored parents to play a leading role in stamping out the craze and said he had even showed a video of the school dance to hundreds of parents.

"The ‘dancing’ of our youngsters today is one step from events that should be occurring on wedding nights," he wrote in an email to parents.

Shana Kemp, a spokeswoman for the National Association of Secondary School Principals, told the Times the organisation had received an increase in calls seeking advice about how to tackle the craze.

"Each generation has its own thing that adults think is inappropriate," she said.

"It’s just par for the course for the changing of the times," she said. "But in some instances, it’s taken too far."