"Markings on the Wall"

There are these two friends, an 45 year old and an 18 year old. One evening, they`re in a bar arguing over which of them can have sex the most times in one night. They decide to settle the issue by going to the local whorehouse and gathering experimental evidence, as it were.

So they get to the whorehouse, pair off with a couple of the ladies, and go to their respective rooms. The 45 year old guy energetically balls his whore and, reaching up with a pencil, makes a "| " mark on the wall. Then he falls asleep. He wakes up in a couple of hours and screws the whore again, albeit a little less enthusiastically this time. Again, he reaches back and marks a " | " on the wall. Again, he falls asleep. He wakes up again in a couple of hours and lethargically humps the hooker again. He drowsily marks another " | " on the wall and falls asleep for the rest of the night.

The next morning, the 18 year old guy barges into the 45 year old guy`s room to see how he did. He takes one look at the wall and exclaims, "A hundred and eleven?! You beat me by three!"