Pg 13 without parent permission slip....... In high school

I think that students should be able to watch pg13 movies in high school without parent permission slips. I think that it is a waste of time trying to print it out for teachers. For students it's a hassle taking it home trying to get it signed, and parents aren't always home.High school students should be able to watch whatever movie as they please at school as long as its educational... And usually it would be educational if the teachers are showing it at school:)....even though this should be allowed for every grade it's at least reasonable for high schoolers who are the age of 14-18, and at home I'm pretty sure they watch rated R and parents don't say anything about it...pg 13wont hurt.