The captain of a fearsome pirate ship decides to have a talk with a rookie that is setting out for his first voyage ever.

Captain: "So, any questions?"

Rookie: "Just one. Since there are no women on the ship and we are at sea for months at a time, what do we do if we get…uh…you know…the urge?"

Captain: "See that barrel over there?"

Rookie: "Yep."

Captain: "See the hole in the side of the barrel?"

Rookie: "Yep."

Captain: "Well, anytime you get the urge, just use that hole in the barrel. Anytime except on Tuesdays."

Rookie: "Why not Tuesdays?"

Captain: "That's your day in the barrel."