How to calculate a guys dick sized based on their looks.
For length.. It's the height of their entire body, the length of their limbs, the length of their fingers, etc..
For girth, it's their bone size. Like if they have thick wrists, ankles, legs, (not peculiarly arms) but like the natural width of their body not from muscle or fat, that's how you can tell how big round they are.
So these two factors, plus the cultural factor, like if they are black then yeah they'll probably have a big penis, but if they are some asian guy then they probably have a small penis. And this is like, super true, I'd say race determines 3 inches of dick size. Because asians can be like 3 inches long, which is like hard to imagine how that would feel to be that way. While black people have outrageously big dicks, like this one guy I saw in this bathroom his dick was like skinny but it was hanging down like a over sized gummy worm, It was at least 3 or 4 times my dick size soft and he was obviously on dead soft so I'd have to say he might have had a 9 or 10 inch dick compared to mine being 7 inches.
Small dicks = anything below 5 inches, Average dicks = 6 inches to 8 inches, Big dicks = 9 inches to 13 inches (largest in world).
For females, this would depend on their vagina depth which can be calculated the same way as this probably. 7ft female, you're not going to hit the back of her vagina no matter how big you are.
I hope this has shed some light onto you guys.