Before modern contraceptives appeared, how did the prostitutes in ancient times prevent pregnancy? There are few records in history books or even wild histories, and it is only briefly mentioned in TV dramas and films. In a movie starred by Gong Li, such a plot can be found: a prostitute drank a kind of soup medicine before receiving customers, saying that she wouldn't get pregnant by drinking it. Of course, since there is no way to examine what ingredients were contained in the medicine, various opinions about the methods for ancient prostitutes to prevent pregnancy emerge.