Emperor Ai of Han Dynasty is a homosexual, and he often lies with his favorite Dong Xian. On one occasion, when Dong Xian slept during the day, he put his head on the sleeve of Emperor Han Ai. Emperor Aidi of Han wanted to get up, but Dong Xian didn't realize that Emperor Aidi didn't want to disturb Dong Xian, so he got up after cutting off his sleeve with his sword. This is the origin of the idiom "sleeve addiction", which refers to the homosexual behavior between men in later generations.