How Rare is a 9 inch cock?

Very rare. Obviously cock size is on a bell curve (pun intended!), with cocks bigger than 8” being very uncommon, but I think rarity doesn’t increase with size after that, meaning 9” cocks aren’t that much rarer than 8.5” cocks.

The number of real life dicks bigger than 7” I’ve seen is fairly small, only 9” or bigger maybe 3 or 4 times.
 
I’ve seen a lot of 9 inch guys.. been with a few and had jerk off rimes with some ..
But as one guy said it’s getting bigger ones like 10.., is harder to find .. I joke around saying I’d have better luck finding Bigfoot before finding one
 
I’ve been with a few 10 inch guys but I been with one guy 11 inches .. girls wouldn’t let him fuck them with it and I was almost to point of saying no or at least say just half of it to at least 8 inches .. but as he was fucking me he really got into pounding my ass and shoved in all the way .. and from where them girls wouldn’t let him fuck then he pounded me so hard I think he was taking of of that frustration out on my ass ..

I was sore for few days but that didn’t make me say no the next time he came over
 
There's been a separate thread about finding a legitimate 10 inch penis that's been running for many years now. A $10,000 reward to the owner and another $10,000 as a referral fee to someone who finds a legitimate 10 incher and brings them forward.

Years and years have gone by, with well over 1000 posts, and nothing close to a legitimate 10 inch penis has ever been shown. A few (2?) truly huge and extremely rare ~9 inch penises have been found. Funny how so many people claim to have encountered a 10 inch penis, but with $20,000 available to grab, not 1 person has been able to provide proof.

Sooo, back to your question about 9 inch penises, read posts numbers 7 and 8 above. ( inches does exist, but they are extremely, extremely rare.