those guys in porn are like 8-9 inches not 12...
"The largest medically verified penis on record is 13.5 inches long and 6.25 inches around, documented in the early twentieth century by Dr. Robert L. Dickinson."So how Big is BIG? World Sex Records, quoting from Simons Illustrated
Book of Sexual Records, says that Kinsey co-worker Pomeroy stated that
the longest penis (they) encountered was ten inches. A 1970
unsubstantiated and unsourced survey stated the largest penis found
was 9½ inches (erect). Published in 1935, Dr. Jacobus's "L'Ethnologie
du Sens Genitale" recorded organs up to 12 inches. In "Everything You
Always Wanted to Know About Sex" Dr. David Reuben makes mention of a
14-inch erect organ, but no source was given. The largest reported
penises would seem to be between 10-12 inches in the erect state.
SOURCE:
Is Penis Size Important?
So I really doubt the average pornstar is around 12 inches man hahaha