Several years ago, in the question-and-answer period after a public lecture, a rather disgruntled young man asked me a question that carried with it a bit of attitude: “You seem to write a lot about sex,” he said, “do you have a particular problem with it?”

My lecture had been on God’s mercy and had never mentioned sex, so his question obviously had its own agenda. My answer: “I write 52 columns a year and have been doing that for over 30 years. On average, I write one column on sex every second year, so that means I write on sex, on average, every 104 times I write. That’s slightly less than one per cent of the time. Do you think that’s excessive?”