Yeah, some of these are on the racy side, but it's not pornography. I assume what she was wearing was pretty sheer in the shots where her bust is blacked out. When a school teacher was fired after students discovered she starred in online porn movies, I agreed that it would difficult for her to command respect in class and it's tough enough to keep pubescent boys' attention the way it is.
I don't now about this though. It's not porn, most of them aren't much more than you would see on the beach. If she's a good teacher this seems as though it might be excessive.