There is a spider in Brazil whose venom can cause erection that lasts for hours
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 erections in humans 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.
