A Brazilian spider delivers more than a painful bite that sends most victims to the hospital. Its venom stimulates an hours-long erection. Now scientists have figured out the chemical that seems to be responsible for the penis boost. In Brazil, emergency room staff can immediately spot the victims of a bite from the Brazilian wandering spider (Phoneutria nigriventer). Patients not only experience overall pain and an increase in blood pressure, they also sport an uncomfortable erection. "The erection is a side effect that everybody who gets stung by this spider will experience along with the pain and