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This photo taken on April 29, 2016 shows Chinese students having a laugh as they attend a course taught by Xie Shu (not pictured), a teacher at Tianjin University in the northeastern Chinese city of Tianjin. Xie's Theory and Practice of Romantic Relations course at Tianjin University includes lectures on pick-up techniques, self-presentation and how to entice the opposite sex. / AFP / FRED DUFOUR / TO GO WITH China social education university,FEATURE by Ludovic Ehret (Photo credit should read FRED DUFOUR/AFP/Getty Images)

This photo taken on April 29, 2016 shows Chinese students having a laugh as they attend a course taught by Xie Shu (not pictured), a teacher at Tianjin University in the northeastern Chinese city of Tianjin.
Xie's Theory and Practice of Romantic Relations course at Tianjin University includes lectures on pick-up techniques, self-presentation and how to entice the opposite sex. / AFP / FRED DUFOUR / TO GO WITH China social education university,FEATURE by Ludovic Ehret        (Photo credit should read FRED DUFOUR/AFP/Getty Images)