My first experience of pornography came at the age of nine. As a day boy at a mostly-boarding prep school I was secretly commissioned by a boarder to buy him a copy of the News of the World, so he could look at the semi-naked women. I couldn’t see the point myself. A few years later, now myself at boarding school, I was allowed to look at a friend’s pack of five black-and-white photographs sent in a plain envelope from Amsterdam. I was overwhelmed.