I spent many years in the military and couple that with I have been a practising nudist for several decades and have been to probably over a hundred nude beaches and nudist resorts around the world. Many of those resorts/beaches many times on nearly every weekend/holiday. I lived in Europe for many years and nudist resorts are almost everywhere locally. Often relatively smaller resorts (compared to the mega nudist resorts), large crowds though of local folks, and full of all sorts of people, singles, couples, families. That does not count the popular nude beaches along the Mediterranean and the Baltic/North Seas where on a holiday weekend if the weather is good you can see thousands of nude bodies by walking the beach. I have also been to every nudist resort in the Carribbean, most several times, and most of the better known resorts in the US several times (at least), as well as a bunch of smaller resorts and six nude beaches in the US (two in Florida (one now closed), two in CA, and two non sanctioned but still popular nude beaches in Hawaii). And yes, I was a practising nudist even while in the military. What you do on your own time is your business on weekends, holidays, and while on leave (vacation).
I did not see that many erect, though erections at nudist resorts do occassionally occur, though no one takes advantage of that situation. I can not possibly be totally accurate on "how many" nude men I have seen. Probably over 100 thousand or more. Conservatively estimating that number. When you see over 3000K nudists nude in one day of a weekend, it is easy for that number to add up, especially since I have been a very active nudist for decades...lol. Other places and times I probably saw only a hundred nudists and many times the number was probably more than 500 but less than a thousand in a day. Of course, that was both men and women and kids, but you get the idea.
My impressions are that the average of all ethnic groups, races, heights, weights, etc is probably about 5-6" or so erect. Judging solely on soft size. Though I do think there is some truth to soft size getting bigger in many cases for younger nudists. But since there is absolutely no correlation in any way with soft size and erect size, it is even harder to judge. I know of guys who are big soft, and grow nothing but get very hard and are the same size, and I have met a guy who was about 6" soft and grew to almost 14". Go figure.
But I have also seen in the military, and especially as a nudist, quite a few guys who were huge soft. Easily 8-12" soft. While they are rare as part of the overall population, they exist in larger numbers than I think many folks realize. No idea on ratios, and no one would know. To speculate is simply to guess. To guess with conviction is simply to show off a wild ass guess as fact. Though I probably have seen a few hundred guys who were over 8" erect and probably, and this is a big guess (on the numbers, not on the size), maybe 100 plus who were 11- 12" or more erect, and maybe a dozen plus of those who were 14" plus erect, and a few who actually beat that. Just a guess on the numbers (I sat here for 20 minutes trying to remember all the instances from many years) but I am certain of most of the sizes, because most of those I did talk to and when did talk usually talk we usually did talk our sizes. In a sea of nude bodies, two very busty women do notice each other (ask women, they will confirm this) and two or three guys exceptionally endowed notice each other as well. It usually worked out that we found a way to say "hi" and break the ice. If we did not, often the women we were with did...lol.
My numbers counts the military, nudist weekends/vacations, at college, work, and living my life. I once met two guys at a car dealership who fell in to that catagory. They were not nudists, but they were both about 12" plus. I also have come to the conclusion over time that nearly everyone who tries nudism, likes it, if they can get over the fear to try it and "what would the neighbors think if they found out" mentality. Also, while nudists are certainly, tall, fat, thin, short, etc, like everyone else, I think once they try it, a lot of very endowed men, and women, especially enjoy it and become avid nudists. It is a very liberating experience and you are out in the sun and nature and meet some interesting people. That may skew the numbers of my estimated guess a bit. But it is just my observations. Just last Independence Day, at a resort, I met a guy who was erect 14.5" long and almost 8" around. His wife saw me in the "sea of bodies" said Hi at the bar, and later took that introduction to introduce me to her husband. It happens. Not common, but not totally rare either.