Spider venom may yield virility — and contraception — if it doesn’t kill you first:
Scientists have discovered a potentially marketable contraceptive in the venom of Chile’s black widow spider, whose bite is fatal to many but can also cause prolonged, painful and involuntary erections in men.The venom of the Latrodectus mactans, a variety of black widow found only in the south of Chile, has spermicidal properties not found in black widows in other regions of the world, Chilean Dr. Fernando Romero said.