Something a little bit different this time; there's a well-known and acclaimed documentary from 1994 about the cult cartoonist Robert Crumb. In it, pornographer Dian Hanson is very complimentary about the size of his dick.
From around 52:18 here, but it's one of those uploads where the speed has been altered to avoid being taken down, I guess. You can change the speed in youtube to 0.75 (where you choose video quality), but it's still a little messed up.