It’s certainly true that there is more variety in publishing now – and therefore more potential for confusion. A couple of generations ago you had Enid Blyton on the one hand and George Orwell on the other, and that was that. One generation ago, at least in the United States, things were already getting complicated: in 1969 Philip Roth wrote Portnoy’s Complaint, for adults. In 1973 Judy Blume wrote Deenie, for teenagers. Masturbation featured in both of them, and as a result both books were banned in many libraries across America. But Roth would never argue that he’d written his book for children, nor does Blume claim she was aiming to produce something for grown-ups. Portnoy is an undisputed classic; but Deenie may well, secretly, have provided more people with a sentimental education.