God created Adam and informed him that he had given him a brain and a penis. The brain was a good gift as it allowed him to do many things.

The penis was also a good thing as it allowed the race to continue. The problem was that God had only given Adam enough of a blood supply so that he could only use one of them at a time.

Men are naturally competitive. Even in the Garden of Eden, Adam was afraid Eve would like the snakes fruit better than his.