A Strange Observation

It may be a coincidence but i seem to notice a lot of the larger guys have a more flexibile behind the balls area it seems crazy and perhaps it is but when they pull their dick the whole are seems to move with it, mine doesn’t i have however noticed they all seem to have a lower body fat %, is it just a low bodyfat thing or is there some way to stretch the region behind the testicles.

I could just be crazy.