"When God was making the world, he called man aside and gave him twenty years of normal sex life. Man was horrified: "Only twenty years?!" he cried. But God would not budge. That was all he would give him.

Then God called the monkey and gave him twenty years. "But, God! I don't need that much," said the monkey, "ten is enough."

Man spoke up and said, "Can I have the other ten?" -- and the monkey agreed.

Then God called the lion and gave him twenty years. The lion, too, only wanted ten.

Again the man said, "Can I have the other ten?"

The lion roared, "Of course!"

Then came the donkey. He was given twenty years, but he also only wanted ten. Man asked for the extra ten, and got them.

This explains why man has twenty years of a normal sex life, then ten years of monkeying around, ten years of lion about it, and ten years of making an ass of himself."