I see a bunch of BLACKED/BBC stuff get posted occasionally and no one ever seems to call the poster on it. So here is a simple guide to break the myth:
step 1: poke through a pornstars twitter
step 2: find picture with reference item
step 3: match reference picture to hand size
in handjob picture
step 4: find out actual dick size

here is an example with julio gomez who claims his dick is 14 inches long. debunked using a jewel cd case held by marica hase (actual dick is around 6.5-6.9 inches)