《汉书·志·地理志下》
当初淮南王特别对待国中百姓家有女儿的，以等待有游士来娶她们，所以到现在女多男少。
初淮南王异国中民家有女者，以待游士而妻之，故至今多女而少男。
At first, the King of Huainan treated the people in the country who had daughters in a special way, waiting for travelers to marry them, so there are still more women than men.