He points out that most of the Han emperors died young, creating a crisis for the imperial succession. Because of this, combined with the fact that the emperors had large numbers of concubines, their physicians suggested many methods for bedroom use, intended to help them produce healthier offspring and improve their own vigor.
他指出，漢代帝王多數短命，造成帝嗣傳遞的危機，再加上帝王后宮太多，於是方士們提供各種房中方法，作為優生及養生的依據。