POPSUGAR Love Textbook Perverted Math Textbook Some Perv Wrote a Textbook by GiggleSugar 3/06/08 5 Shares Like us on Facebook What about the angle at which she lifts her heel and rams it into his shin? Thanks, College Humor! Read More TextbookSchool HumorSexy HumorPervertJapanMathHumorSchool Get inspired with our daily newsletter DIY Food Tech Love and Sex Vegetarian Home Sign up with By signing up, I agree to the Terms and to receive emails from POPSUGAR. xChantilly 7 years Um, why is it tagged with "Japan?" The words are in Korean. k-squared 7 years Pythagorean theorem for the perverse, hah.