I've been going to JO club for years and live the lifestyle. And I have seen hundreds and hundreds of hard dicks, in real life. The vast majority of men range from 4 - 6 inches in length and are about thick as a toilet paper roll.
There were guys in the 7 inch range and they were uncommon and around 8 inches is rare. I've never seen anything around 9 inches.
Now these are just eyeball measurements. There are guys out there who asked me to measure their dicks. So I could tell it was "x" inches long and "y" inches thick. So I have more or less a good idea of how big a dick is, a ball park estimate anyway.
There were guys in the 7 inch range and they were uncommon and around 8 inches is rare. I've never seen anything around 9 inches.
Now these are just eyeball measurements. There are guys out there who asked me to measure their dicks. So I could tell it was "x" inches long and "y" inches thick. So I have more or less a good idea of how big a dick is, a ball park estimate anyway.