This paper covers four related areas of the militant display of female private parts (yinmenzhen) in ancient China. First, it argues the research on this topic with a treatment of previously unexplored historical sources. Second, it reflects on and explains previous scholarly views related to this practice. This serves to further explore Fang Yizhi’s notion of the “magic of robes” (qunchai zhi yan). This is to say, female private parts and the symbolic notions of uncleanness associated with them were originally taboos of the bedchamber, but through the mediation of alchemy, became an illicit practice on the battlefield. I believe that the significance of the use of the magic polluting power of the female body in the militant display of private parts lies in the strategic “open” deployment of the long hidden taboo of alchemy on the battlefield. In contrast to J. G. Frazer’s definition of taboo as passive magic, the open display of female intimate parts is transfigured as an active, aggressive practice. Third, the paper reviews Jiang Shaoyuan’s writings about the history of superstition, and in particular his short works (xiao pin wen). This subgenre of writing endows the author with a great sense of historical reality and offers inspiration to the highly regimented academic environment in Taiwan. Fourth, the majority of extant historical accounts related to the militant display of female private parts are to be found in unofficial historical texts. This paper researches the writings of Qu Duizhi, Xu Yishi, Huang Qiuyue, and Gao Boyu and so on. Based on the historical sources they refer and topics to which they attend, I argue that the study of the history of popular psychology must pay adequate attention to unauthorized history and other informal writings. Because of these writers’ works, we no longer need to lament the inaccessibility of the “rare texts.”