A couple kisses after a graduation ceremony in Anhui University, Hefei, Anhui province, June 28, 2013. [Photo/CFP]

Ren Zhipeng and his girlfriend Zhu Xiaolan pose for a photo in the campus of Qingdao Normal University in Qingdao, East China's Shandong province, June 13, 2013. Ren will go back to his hometown Pingyao county in Shanxi province to prepare for the next year's postgraduate entrance examination and Zhu will go back to her hometown Xi'an in Shaanxi province for work. [Photo/CFP]