Yes more than a few times. My own exceeds 12".
Excluding my own I have a good buddy, Bil or Billy who I initially met through the lifestyle scene about 5 years ago, whos got a 13". At the time we were complete strangers to one another. Like me he's a bit of a flaunter and when he'd heard chatter about a guy at the resort that was 'hung like a horse' he couldnt help but introduce himself. He explained he'd heard several couples mentioned they'd personally had experiences with me and I apprently was the guy that possesed the other 'horse dick' and if it wasnt too weird, no pressure, would I mind showing it to him and he'd also show his for comparison. Cutting to the chase, I didnt mind at all (i've had people curious and ask to see it for many years since a teen, so its really no big deal to me) and we showed each others our dicks. He was surprised to meet a guy bigger than his for once but was very chill and cool about it. We quickly found we had lots in common and similar kinks and exeperiences. We quickly became pretty close buddys and have kept regular contact since, often have done FMM roasts together and FFMM partner swaps too.
Thats perhaps a bit of a long winded explaintion but for context we were not already buddies that found out we were large. Rather became friends through out mutal shared interests and huge peens.