BackFire
Blood. It's nature's lube
A few things.
There is a snopes article on this story from 2014. The story in the OP is from today. This is an immediately red flag as the story in the OP is being presented as a current event, when in reality it's from 2014. So there's your first misleading bit in the article.
Also according to snopes, the photo is not from a middle school class at all, but from an adult sex class that the woman teaches in Toronto. Yes Toronto, not Florida. The woman in the image has been identified as a Toronto sex educator.
The original story isn't even on inforwars anymore.
Here is the snopes article about it.
http://www.snopes.com/media/notnews/strapon.asp
Relevant bit -
"The photos displayed in the original article were not in fact pictures of a Florida substitute teacher named Sharon Mercer, but rather pictures of Carlyle Jansen, the founder and owner of Good for Her (a progressive, female-friendly sex store in Toronto, Ontario), who has upon occasion been invited to give talks about sexual health at Toronto-area high schools. But Ms. Jansen told us that she also teaches sex ed classes for adult audiences, that the photographs displayed in the outrage-provoking article were snapped at a university-level (not a sixth grade) class, and that she “would not have done those positions and discussed strap-ons to that extent in a high school setting.”