Non-Tumescent Foreskin Retraction
This graphic comes from a site dedicated to the preservation of the foreskin. It shows clearly how the various parts function, and how the glans is protected by the skin.
[if the copyright owner cares to email me, I will acknoweldge copyright and link to his site]
Skin 
Mucosa 
Ridged Band
The action is exactly similar on a tumescent penis. The originator chose flaccid in order to keep erotic confusion at bay.
How could ANY parent deprive a child of sensitive cells, of pleasure? HOW?
