Theo Spark

Every time an Indian walks into the chief's teepee he sees that the chief is
masturbating. They finally realize this is a serious problem, so they fix him up
with a nice woman, and she starts living with him in his teepee.

One day, one of the Indians walks into to chief's teepee and there's the chief
masturbating again.

He says, "Chief, what are you doing? We fix you up with a beautiful woman."

The chief says, "Her arm get tired."

H/T Pete Hurrell