The Professor Rides a Foreign Mare, the Professor's Wife Grazes on Tender Grass

Katya, a Russian exchange student, is the model student in the professor's eyes by day—and the wildest cat in the study room by night. When Zheng Jianguo catches her in an affair, she isn't afraid; instead she follows the professor home and moans for him right beside his wife's bed. The wife, Liu Min, pretends to sleep, yet the sheets grow damp. She doesn't make a scene—she simply invites her husband's student Lu Hao over. Four people, two beds, lots drawn for rooms—who spends the night with whom is left to fate. The professor rides a foreign mare; the professor's wife grazes on tender grass. In this swap, no one gets to leave the bed first.