Well to be honest i thought i was small, reason being when in high school all the popular lads looked a lot bigger than me in the changing rooms...
but at that time i hardly had pubes never mind a big cock. Again when watching porn at that age, own preference to size? how u are flaccid? how girls perceive cocks? etc.. (never dated or had sex in high school yrs because of it)
Gradually things changed, i became bigger and at around 19 i was seing a married woman, she was 39 at the time, i was still a virgin and i'd never had a gf or shown my cock to anyone.
I felt really comfortable in her company and i knew from the start she wanted sex, after a couple of days just chattin and flirting, we had a kiss, and i was really turned on by this point - directing her hand towards my crotch to feel my bulge, and she immediatly blerted out OMG your massive!! And i was quite surprised by it!?
We eventually had sex the night after, the whole experience was amazing!
She couldnt help telling me how turned on she was when she first saw my cock and how she watched it grow to its full erect state. Even after having two kids she still had a little trouble taking it all... but loved it when i pounded my 8x6 into her doggy style.
After that i had a couple of flings with girls but none that matched up to that, a couple of them couldnt take me, one girl refused to have sex because of my size.. But all in all everyone i have shown my cock to (now) says its big!!! so i wouldnt say it was that common, especially in everyday terms..