One day the Lord came to Adam to bring him some news.
"I've got some good news and some bad news" said the Lord.
Adam looked at the Lord and said,
"Well, give me the good news first."
Smiling, the Lord explained,
"I've got two new organs for you.
One is called the brain.
It will allow you to be very intelligent, create new things and have intelligent coversations with Eve.
The other organ I have for you is a called a penis.
It will allow you to reproduce your own intelligent new lifeform and populate this planet.
Eve will be very happy that you now have this organ to give her children."
Adam, very excited, exclaimed
"These are great gifts you have given me. What could possibly be bad news after such great tidings?"
The Lord looked upon Adam and said with great sorrow,
"the bad news is that when I created you I only gave you enough blood to operate one of these organs at a time."