Teaching young teenagers about sex is a tricky matter. It has to be attempted, because otherwise curiosity will lead potential pupils to the steamy parts of the internet, where you can claim access to “adult” stuff by simply clicking on a “yes” button. But avoiding potential pitfalls is not easy, as the Education Bureau (EDB) has recently discovered. One wishes to describe the machinery accurately, as it were, while subtly discouraging premature experiments in its use. The EDB’s efforts came in for a good deal of criticism. One of the potential problems is that your efforts to foster celibacy …