It was my curiously about girth that led to fining this site, by way of a forum post someone made regarding girth and volume. (Had a really neat chart relating length and girth and volume...anyway...)
Yes, 6in... well really more than 6in (which is roughly 2in across, as a rule of thumb given cocks aren't exactly circular)... seems to be rare. Along the lines of what I've commented elsewhere, were it either (a) more common and/or (b) more widely preferred by women, believe me, you'd see it reflected in the sex toy industry. There are a TON of toys around 1.5-1.6in diameter, a solid number at 1.75in, and then very few at 2in...the reviews for which often echo that it looked HUGE / bigger than expected when unboxing. (Bad dragons are a just a total niche situation.)
Also, for clarification, a toilet paper roll is about 1.5in in diameter, roughly the girth of the average guy -- hence we have the toilet paper roll test...
A paper towel roll is 1.75in in diameter (about 5.5in girth) and maybe poses a more appropriate test of being toward the upper end of the bell curve...
As for me, I'm verifiably 7.5in around (about 2.5in thick)...6in around (2in thick) at the head. I've posted with a tailors tape, a beer bottle and a soda can in the spirit of authenticity. I've seen only a couple guys thicker on the site; one looked legit while the other was an obvious pumper. I'm an outlier... totally never imagined that was the case until I landed here & subsequently on Reddit, but... turns out I'm in the population the magnum XL was apparently engineered for.
If you're 6in, be happy about it... especially if she's happy about, ha! And don't be that guy who says he 7+ and then has his thumb and middle finger fully wrapped around it or resorts to some other form of photo trickery. I don't know what that accomplishes; just sucks the fun out of the site and keeps larger girth from being more appreciated than length, as it ought to be!