It dont nessisarily need to be fake, because we really dont know how tall or short that dude is. And with the perspective with table in the background with the glass.
We dont really know, something small cna be big if you place it at the right place same thing with big.
But I know it is fake, the ribs on the penis combine with the vein are identical at three spots.
The other was just a reminder that things can be untouched, its just about the perspective.