Polo, a blue-blooded sport closely associated with royalty and celebrities, has become more charming as time goes by. In the UK, there are three harsh criteria to judge "real gentlemen" - whether the family enjoys hereditary royal titles; whether they play polo; and whether they smoke cigars. Another popular saying is equally overbearing - "If your annual salary is 20,000 dollars, you can play golf; if it's 20 million, then you should play polo."