Mommy, Daddy, the Principal and Shrek

So... I feel like I'm on a desert with this one. Alone with just the Mr. and feeling like an overprotective, freakish mother.
Feel free to leave comments... I will examine my position and more than likely, I won't change my morals.
As a reward, Goosie's school is taking the kids (and I mean all grades) to a local theater to see the new Shrek movie. Yes, I said Shrek. Shrek is PG. Goosie is 6 years old.
We decided that our kindergartener was not going to see the movie due to the sexual innuendo, foul humor, and the language. When I called to ask the Principal if there was an alternative, he seemed like I was crazy for not letting my child attend such an event. He even stated that he was allowed to take the kids to a PG-13 movie. I questioned that statement with the fact that he has a school of children ages 12 and under.
I feel like I'm on an island these days because I don't let my kids watch certain movies. They are allowed an hour of TV a day and most days don't even get that. Goosie is now bordering on a third grade reading level and Boomer can count to 30, spell his name, knows his phone number and started learning sight words.
I like interacting with my kids. They are so funny and interesting... I know that when I send them out into the world they are going to experience all types of "Shrek" life but for a school reward... I find it a bit bold.