Couples wait to participate in a staged mass wedding, organised as part of a matchmaking event to inspire singles to get married, at a suburban area of Shanghai May 18, 2013. As couples celebrate the "Qixi" festival on Tuesday, the Chinese equivalent of Valentine's Day, millions of women face stark choices in a society where traditional ideas about matrimonial hierarchy run up against huge economic and social changes sweeping the world's most populous country. There are plenty of men to go round among China's nearly 1.4 billion people but social status can conspire against single professional women, sometimes making it difficult to find a partner. [Photo/Agencies]