GOT some public speaking to do? Here is a tip to keep stress at bay: have sex beforehand. But make sure it’s penetrative sex – the magic vanishes if you pursue other forms of sexual gratification.

Stuart Brody, a psychologist at the University of Paisley, UK, compared the impact of different sexual activities on blood pressure when a person later experiences acute stress. For a fortnight, 24 women and 22 men kept diaries of how often they engaged in penile-vaginal intercourse (PVI), masturbation or partnered sexual activity excluding intercourse. After, the volunteers underwent a stress test involving public speaking and mental …