This guy decides to join the Navy. On his first day of service, he gets aquatinted with all the facilities around the ship he will be serving on. The guy asks the sailor showing him around, "What do you guys do around here when you get really horny after months of being out at sea?", to which the other replies, "Well, there is this barrel on the upper deck, just pump your cock in the side with the hole."
Weeks pass, and the new guy is getting real horny and remembers the barrel. He climbs to upper deck and sees the barrel. Flings his shlong out and starts fucking the barrel. Its simply the best feeling he had ever experienced, it was truly a success!
After he was done, zipped up and merrily walking along, the guy who originally told him about the barrel walks by. "That barrel really was great! I could do it every day!"
To which the other crew member replies, "Yeah, you can every day except Thursday." Confused, the new guy asks why, to which the other guy replies, "Because its your turn in the barrel on Thursday."