In days of old, this young sailor was about to sign up for a 6-month trip on a sailing ship. He asked the captain about sex life, since there would be no women on the ship.
"Don' ye worry about it, lad. We'll make sure your needs are taken care of."
After about 2 weeks at sea, the lad had a bone that wouldn't go away, so he went to ask the captain how to take care of it.
"Aye, lad, 'ere's ya key. Go open up the door under the ladder. In there you'll find a barrel, take the bung out of the hole and insert your manhood. I think you'll find this arrangement satisfactory."
The lad went down, opened the door, removed the bung, inserted his prick and got his rocks off in record time. In fact, it was SO good he asked for the key the next five nights in a row.
On the sixth night, the captain said, "Not tonight, laddie; it's your turn in the barrel."