For a very long time in America, academics were complicated: Schools offered multiple subjects for which challenging assignments and tough tests were the norm. Concerning sex, however, things were simple: There were boys and girls and XX/XY chromosomes — a small point of fact among many things covered in biology class. As for sexual activity, it wasn’t spoken about to children.Now, education appears to have flipped: Sex has been upstaged by “gender identity,” and it’s considerably complex. Moreover, all manner of carnal activity is promoted in class. Academics, by contrast, have been simplified — if the nation’s tanking test scores...