I once made a TV show about an installation by the artist Spencer Tunick, who makes his work out of the naked flesh of human beings. Above the sparkling Tyne, 1,700 people stripped off at dusk and lay across the Millennium Bridge between Gateshead and Newcastle. It was a beautiful and affecting sight. Milling around before and after the installation took place, chatting to the participants, I learned two things: 1) Nudity is completely unsexy when you are surrounded by it; and 2) Never interview a man who is sitting bare-arsed on a bar stool live on television. His squashed-up devil’s bagpipes will be right in your eyeline and it will be terribly distracting.