This kinda proves that 7 inches is actually quite large.
Despite LPSG's existence and the extensive studies out today, people still like to create their own interpretation of what a certain penis size, for example, 7 inches, is.
7 real inches measured from the top is unmistakably big. Lots of girls in real life call a REAL 7 inches something like 8 or 9 inches. There is a BIG difference between an inch in penis size. When I have a half-assed erection, it's 5 1/2 inches. When I have a total hard-on, it's a bit over 6 1/2". There is DEFINITELY a significant difference between the two.
Grab a ruler and make a 7" line and ask people how long they think it is. Almost always they will overestimate.