A couple pass by a sex shop in Shanghai, east China, April 16, 2012. Recent research has revealed that the number of people having premarital sex in China has increased significantly in the past two decades, triggering a new round of debate on the country's marriage regulation and sex education. [Xinhua]

An owner of a sex shop waits for customers in Shanghai, east China, April 16, 2012. Recent research has revealed that the number of people having premarital sex in China has increased significantly in the past two decades, triggering a new round of debate on the country's marriage regulation and sex education. [Xinhua]

Photo taken on April 16, 2012 shows three adjacent sex shops in Shanghai, east China. Recent research has revealed that the number of people having premarital sex in China has increased significantly in the past two decades, triggering a new round of debate on the country's marriage regulation and sex education. [Xinhua]