Why is it entitled "Kiss of the Spider Woman"?
I would argue that the one of the primary reasons for the title is that it refers to the web in which the main character, Valentin, is drawn. Valetin shares a cell with the homosexual/transvestite Molina. Though he tries to resist his/her "poison," eventually...
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Also, it is referenced near the end when Valentin suggests that Molina be a panther woman, and Molina doesn't like that idea because he wants to kiss Valentin. Valentin then suggests the spider woman, and Molina agrees and says he likes it. Later at the end, the imagery of the spider woman in Valentin's drug/torture induced dream reoccurs.