This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Semi-obvious one, but this isn't a crapsack world where all men are rapists. Rather, her vagina dentata has psychic powers to compel people to have sex with her so that it can feed.
Or, in alternative, I Love Nuclear Power strikes again. Living next door to a nuclear power plant did not just mutate her genitalia, it also mutated the sexual instinct of the males of that town, who became compulsive rapists.
Fridge Horror on that one: what about all of the other women and girls in town who don't have teeth in their vagina?