According to a poll of 50 sex therapists, the most desirable sex lasts, in actual fact, mere minutes. Between 3 and 13, optimally. Or, to break it down another way, a span somewhere between Penny Lane and the second half of an episode of My Family. The time it takes to get from Finchley Road to Wembley Park. Barely enough time to toast a muffin. It should be made clear that, apparently, this paradigmatic shag snack does not include foreplay. Nor does it include the enigmatically named "afterplay"... This 3-to-13-minutes statistic is devoted purely to the central, core, essential, elemental,...