Lü Buwei
According to Sima Qian's "Records of the Grand Historian", Lao Ai had a giant penis, being of such size that it could be used as an axle for a wooden carriage. This ability drew the attention of Lü Buwei, who was having an affair with Queen Dowager Zhao, mother to King Zheng of Qin (later Qin Shi Huang), and Lü plotted to make use of Lao's sexual prowess to ingratiate himself with the Queen Dowager.