Why do we censor in Schools?

I hope you misused your words. Because I wouldn't want to watch a person take a horse from its behind, and that's what "full extent" could potentially cover. You're proposing not only removing restriction on access, but actually *teaching* it? >.> I know the example may be a bit extreme, but that is what "full extent" includes.

Ok, maybe I didn't mean full extent. Full extent as in as much as is needed to fully understand what the material is about. You only need to talk about horse sex to visualize it and that'd be sufficient. By full extent I didn't mean live demonstration or traumatizing videos.

(On a side note, in Biology, you don't have to dissect brains to learn about the nervous system. Likewise, you don't have to watch Horse Sex to learn about it.)