A guy was spending the night with a married couple in their apartment. Since they didn't have a couch, they let him share their bed with them.

Once they all went to bed and the husband fell asleep, the wife whispered in the guy's ear, "Pull a hair from my husband's ass; if he is asleep we can have sex."

The guy pulled a hair from the husband's ass, and he didn't wake up, so the guy proceeded to make it with the wife. Not satisfied, the wife told him to do it a second, then a third time, which he happily did.

Finally, the husband rolled over and said wearily, "It's bad enough that you're ****ing my wife in the same bed as me, but do you have to use my ass as a scoreboard?"