SPOKANE, Wash- Central Valley High School has become the latest Spokane-area school to ban informal dances, known as mixers, because of sexually explicit dancing called “freaking.”

The style involves grinding and gyrating against a dance partner or several people at once in what one school administrator said looks like having sex with clothes on.

“I think part of the issue is that the students don’t know how to dance to the type of music that is being played now,” Central Valley Principal Mike Hittle said. “It’s what they see on MTV, and in the clubs, and it’s gotten to the point where it is just inappropriate.”

Prior to a Sadie Hawkins dance scheduled for Oct. 29, teachers will offer dance classes to students who want to learn another way to dance.

Proms and other formal date dances are still allowed at Greater Spokane League schools, but informal mixers are banned at most.

After staff turned on the lights because some students were dancing inappropriately at a recent dance, Mount Spokane High School student leaders voted to do away with mixers.

“Our student leadership looked at it and just said that’s not what we’re about,” Vice Principal Jim Preston said. “We will still try to create opportunities for students to come together and celebrate, but we just want it to be in an appropriate or positive manner.”

Shadle Park, Ferris and Lewis and Clark high schools all banned mixers, district spokeswoman Terren Roloff said.