A matter of protection

Our dear Lord knows
How everything goes
He made us all in His image!
Boys will be boys
Jumping; climbing and swinging
Always on the move; never sitting still
Saving the world; our super heroes!
Thus he knew; before we grew
That males would need more...
Protection!
Their battles and escapades
Meant a much needed upgrade
To protect their brains
Because of their fiery natures!
Thus He enclosed that grey matter
Within a circle of white (matter)
To save them from their own plight!
Giving us females; beyond a doubt
The largest helping of grey matter!