"Femme" is an apt description of the depiction of Madame White Snake and all her incarnations. It refers to a woman who is dangerously attractive, and lures men to their downfall with her sexual attractiveness. In both incarnations of Madame White snake, the authors depict her as bewitchingly beautiful. Toyoo, her human lover in "Lust of the White Serpant" cannot shake the image of her beauty from his mind and dreams of her, and finds himself "disturbed and agitated" by her "ethereal beauty". In "Eternal Prisoner," Madame White Snake's bewitching beauty follows her lover Hsü into his dreams, and the next morning "he was so distracted that he could not concentrate on doing business." Both of these stories align negative connotations with her beauty, suggesting that her sexuality is the cause of their distraction. In addition to distracting sexuality, the irregular characterization of Madame White Snake might be another trait her character has in common with the archetypical noir femme fatale. In her essay analyzing the noir film from a feminist perspective, Christine Gledhill writes "Not only is the hero frequently not sure whether the woman is honest or a deceiver, but the heroine's characterisation is itself fractured so that it is not evident to the audience whether she fills the [femme fatale] stereotype or not". 
What term refers to a dangerously attractive woman who often leads a man to his downfall?
Etherial beauty