Because working in adult entertainment means you've seen more X's than your average mathematician, now there's Britain's own Blackboards in P*rn. Celebrating "pornographers who go the extra mile" by set-dressing classrooms with actually, curiously intelligent slate scrawlings, BiP transcribes everything, dissects it, and grades it for accuracy -- so unlike the "students" he casts, the producer might not always get an "A". Just some of the strictly SFW examples:
Chemistry: The unmistakable chemistry between the leads is ignored here, in favour of the more covalent style of bonding taking place in the formula for orthosilicic acid, though sadly the teacher "writes SI (sulphur iodine) instead of Si (silicon)", a foolish error, considering how much of the stuff is right there in front of him.
Verdict (refers only to the stuff on the blackboard): "5/10 - rather sloppy"
History: Although it's not made clear if the stars have any together, they certainly have some scrawled behind them, apparently covering "Imperial Russia 1609-1752". The fact that "the Russian Empire wasn't founded until 1721" is made up for by Mr. Stefano's map, which is "A Level standard or higher", though that's not the hardest thing this student will have to contend with! She's about to have sex. With Mr. Stefano.
Verdict: "7/10 - A very good effort"
Music: In this "introductory level" examination of Mary Had a Little Lamb, the "treble clefs have been beautifully drawn", but, having been distracted by clefts, the educator's made the fundamental error of merely adding "four lines in each stave instead of five", making it "very difficult for the students to know which notes to play". Somehow, "the fact that the last line is G helps", despite the student losing her G-string midway through class.
Verdict: "5/10 - A good effort, marred by a silly error"