"Teachers' unions advise members to avoid ever being alone with a pupil. Only close relatives (and not always they) dare show a child physical affection. Scouts and other youth organisations struggle to recruit volunteers. And I doubt that, if I were now 17, a young, single teacher would invite me to dine alone at her home. Since I had never previously dined out, I suppose that would be my loss. It is right that we now abhor child abuse and no longer tolerate abuse of authority for even low-level sexual gratification. But do we need to go so far? Can't we forbid the sex but still allow intimate relations between teachers and pupils, adults and children? Even as I write that sentence, I realise that "intimate relations" is itself ambiguous and that, no, we probably can't have our cake and eat it."