GORHAM, Maine -- A high school principal in Maine is canceling school dances because of students' dance moves and the, "culture of grinding," reports CBS Boston.

Gorham High School Principal Chris Record sent a letter to parents and students explaining the cancellation of school dances.

"It is by no means the students' fault, but the dancing they have witnessed on MTV/VHS/movies involves primarily only sexually suggestive grinding," Record explains in the letter.

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He says school administration, dance chaperones, some students, and some parents have struggled with the, "modern dance culture."

Record details to parents exactly what grinding entails, and says it's making dance chaperones uncomfortable.

"Grinding basically involves a girl having her back and buttocks pushed up/pulled up against the boy's groin with the boy's hands on her hips and other places," he writes.

He also says younger students have complained about being pressured to participate in grinding. Last year, most students walked out of a homecoming dance after being reminded that grinding was prohibited.

"The following week, GHS was disrupted by an uprising of sorts by the seniors and juniors, demanding that grinding should be allowed," the principal writes.

But according to the letter, prom will still go on because "it is a classier event."

Read the entire letter here.