African Penis Growth Technique.

A couple was watching a documentary about an African tribe. They learned that when

each male member of this particular tribe reaches a certain age, he has a string with a

weight attached to it tied around his penis. After a while the weight stretches the penis
until it's 20 inches long.

Later that evening, as the man was getting out of the shower, his wife said, "let's try the African string and weight technique honey".
The husband agreed, and they tied a string with a weight to his penis.
A few days later the wife asked, "how is our little experiment coming along?" The husband replied "Well, it looks like we're about halfway there".
The wife impressed and said, "you mean it's already grown to 10 inches?"
"No" the husband replied. "It's turning black".