It is said that if we see members of the opposite sex smiling at someone we are according to a group of British psychologists more likely to be attracted to them. Research found that women ranked men as siginificantly more attractive if they had been shown proir to seeing the pictures of the men pictures of women smiling at them. Although it was found that men responded to a lesser degree the study suggested that attraction for both sexes bases itself around similar properties - smiling. It may well be common sense but now it is offical. 
In response to the results Ben Jones, author of the paper in the Royal Society's biological research journal, said "So when you're out in a bar, there's an advantage to being nice to everyone, because if they're smiling at you it's going to make you more attractive." A light hearted response to a light affair. Such examples of experiments carried out all across the country may be difficult to justify but nevertheless it has made fact what we have always hoped was the best way to attract someone.