Sex joke «Adventureous Girl»

In search of adventure, an attractive young lady decided to head for the Far East, and stowed herself away on the first ship available. After a month, she was discovered by the captain, who was surprised to see that, despite her time at sea, she was remarkably well fed and clean. Though realising she must have been befriended by someone on board, he was surprised when she admitted that she had been to the cabin of his trusted first officer every morning. Apparently, the nice young man provided a hot bath and three-course meal, and said that he would continue to do so until they reached Japan.
"And what did he ask in return?" demanded the captain.
"Well, you might say that he took advantage," blushed the girl.
"I'll say he did," chuckled the old sea dog, rubbing his whickers. "You're on the Liverpool to Birkenhead ferry!"