From China Daily:

The Municipal Government of Nanjing, capital of east China’s Jiangsu Province, issued a regulation in May requiring officials to report their extramarital affairs, with a belief that the stipulation could curb corruption.

According to Marriage Law revision expert panel statistics, 95 percent of China’s convicted corrupt officials had mistresses. In south China’s economic-booming cities of Shenzhen, Guangzhou and Zhuhai, all the officials involved in the 102 corruption cases investigated in 1999 had mistresses.