Answer
The affair between Shi Pei Pu and French diplomat Bernard Boursicot lasted for 20 years. It began in the 1960s and ended in the 1980s. During this time, Shi Pei Pu posed as a woman and seduced Boursicot, who was unaware of Shi's true identity. Shi used Boursicot to steal state secrets from France and pass them on to the Chinese government.