To return to the original question, being sexually aroused, alas, is not an aid to decision-making. Studies have shown that it can make us impetuous, much as you’d expect. But what is striking is that we greatly underestimate its effect. When Dan Ariely, a professor at Duke University in America, and author of “Predictably Irrational”, experimented on his undergraduates, he found that they had no idea of the extent to which they were being led by their libidos. One reason, Ariely believes, is that we have only a limited mix of emotion and cognition to draw upon. Increase one and you automatically detract from the other. So Robin Williams may have been making a valid psychological point when he said: “God gave men both a penis and a brain, but unfortunately not enough blood supply to run both at the same time.”