Superman: Man of steel weakened by arousal or getting spanked

Before he had sent his Son off to the third planet in the Sol System Jor-El, having found out that a member of his race would gain superpowers under a yellow son, had decided to place a weakness in his Kal-El's genetic make-up. He might not have done so if he knew that the exploded pieces of their home planet would effect his Son as well, but as he was just a scientist and not a time traveler he had no idea of it. Jor-El altered his newborn son in the hopes of keeping him humble so that if the boy was spanked, or when he grew older and became aroused Kal-El would lose all but his near invincibility. Jor-El wanted to make sure his Son still kept that ability not wanting someone to accidently kill him when he was weakened. Other than when Kal-El was spanked or aroused Jor-El knew his child would be one of the strongest beings on the planet. He just hoped the weakness that came from such events would help his boy not get to full of himself and keep him humble.

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