Scientists discovered that the toxin of the Brazilian wandering spider can improve the sex lives of men who were bitten!
Their investigation follows reports that men bitten by the Phoneutria nigriventer experienced priapism - long and painful erections.
A two-year study has found that the venom contains a toxin, called Tx2-6, that causes erections. ... The Brazilian and US researchers interviewed men who claimed their sex lives had improved after a spider attack.
Link - Thanks David R!