Nowadays there are a number of sources that give us relatively unbiased information on what people do at sexual intercourse. One frequently quoted example is the “Sex in America” data—more popularly known as “The Laumann study.” We in the United Kingdom of course have a bigger and better one authored by Catherine Mercer and her colleagues. These papers are easily accessible on medical and general computer search engines. But I am pretty sure the average man (or woman) on the Clapham omnibus has neither seen them nor heard of them. In spite of mass sex education in many European countries (this starts at the tender age of 7 in the United Kingdom), I think that what Hollywood portrays is more likely to be accepted as normative behaviour than the findings of population studies. A good example of sexual inaccuracy is in …