On October 14, 2007, chumbucket lickin' D. Sellers, Franklin, TN said:
How does a pirate tell his wench he wants to have sex?
Drop yer sails and prepare t' be boarded!
From: At work I do a lot of driving. It gives me time to think, and that leads to thinking about pirates. For some reason, "prepare to be boarded" got into my head. I then thought it would be a good punchline. So, I just came up with the joke.