"Scoring with a friend" joke

A couple has a male friend who's visiting from out-of-state, when an unexpected blizzard blows in, and keeps him from traveling. Since the couple has no guest room, he states his intention to find a nearby hotel, and be on his way in the morning.

"Nonsense," says the wife. "Our bed is plenty big enough for all three of us, and we're all friends here." The husband concurs, and before long they're settled in: husband in the middle, wife on his left, friend on his right.

After a while, the husband begins snoring, and the wife sneaks over to the friend's side of the bed, and invites him to have sex with her. Naturally, he'd like to, but he's reluctant. "We're in the same bed with your husband! He'll wake up, and he'll kill me."

"Don't worry about it," she says, "he's such a sound sleeper, he'll never notice. If you don't believe me, just yank a hair off of his ass. He won't even wake up."

So the friend yanks a hair off the husband's butt, and sure enough, she's right. Her husband sleeps right through having a hair yanked out of his ass. So, she and the friend have sex, and then she goes back to her side of the bed.

After about twenty minutes, though, she's back on his side of the bed, asking him to do it again. The same argument follows, another hair is yanked from the husband's rear end, and again they have sex.

This keeps up for about half the night, until after about the sixth time, when the wife goes back to her side.

Then the husband rolls over, and whispers to his friend, "I don't mind that you're shagging my wife, but do you really have to use my ass as your scoreboard?"