A group of guys go on a ship after a few days a guy got horny so he went up to the captain and asked "What do you guys use when you get horney?"
The captain said there's a barrel over there with a hole in it we use that"
The guy replied "Great when can I use it" The captain said "Everyday other then Tuesday"
The guy asked "Why not Tuesday?" The captain grinned and said "Cause that's your day in the barrel."