The Brazilian wandering spiders appeared in Guinness World Records 2012 as the world's most venomous spider. Its venom can cause priapism in humans. Priapism is a potentially painful medical condition, in which the erect penis or clitoris does not return to its flaccid state, despite the absence of both physical and psychological stimulation, within four hours. A component of the venom (Tx2-6) is being studied for use in erectile dysfunction treatments.
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