Pornography is a $7 billion-a-year industry worldwide. Pornographic films outnumber other films by three to one, and gross $1 million a day in the USA alone. British pornographic magazines sell 20 million copies a year. One American man in 10 reads Playboy, Penthouse or Hustler each month. Italian men spend $640 million on pornography a year, with pornographic videos representing 30-50 per cent of all Italian video sales. All that pornography, yet no-one talks about it. It’s like an unacknowledged cancer that metastasizes best when no-one goes for x-rays or feels for lumps. What is pornography and is it anything to get steamed up about? David Miles reports.