Yoyototo hit the nail on the head.
From a volume perspective, a 6 inch penis that gains .5 inches in length gains 1 cubic unit…a 6 inch penis that gains .5 in girth gains 2.5 cubic units. That’s about an 8% increase from a half inch gain in length and a 23% increase from a .5 inch gain in girth.
So, that said, your girlfriend is much more likely to see AND feel a .5 gain in girth. We could go further, basing the way light hits your girlfriend’s cornea and her perception of dangly length vs. meaty volume…but I would have to take her into my optometry studio. Ahhhhhhhhhhhhhhhh.
Baywatch have a good weekend and dangle your meat wagon off the Northeast coast.