Reasons for naming!

A young Indian chief's son went up to his father to get some information about his name and the names of his sisters for a school project.

He went to father and asked, "Father, why did you name my first sister Deer Running?"

The wise Indian chief turned to his son and said, "Well, the day that she was born, I looked out of the tepee and the first thing that I saw was a deer running.

"Oh", said the son,"then why did you name my other sister Sun Shines Strong?"

"Well," said the father, "the day your other sister was born was very hot and blistering on the skin. That's why we named her Sun Shines Strong."

A bit puzzled by now, the wise Indian chief looks at his son and said, "Why do you ask, Two Dogs Screwing?"