I don't see many people quibbling with notion that the average cock size is 5.9 with stdev 0.8...so I will.
That means that 68% or so of erect penises are between 5.1" and 6.7"...and, since we are interested in the top end, 13.6% are between 6.7" and 7.5" with 2.1% between 7.5" and 8.3".
I certainly haven't conducted a scientific study but I've seen some cocks in my time (ahem) and I don't buy that only 14 out of 100 are between 6.7 and 7.5 with only 2 larger than 7.5. There are more large erect penises than that. I can't tell you if I've seen 100 penises (I haven't exactly been keeping a running tally of number of penii seen) but I've seen many more than 2 over 7.5".
This is BTW based almost exclusively on North American cocks, plus some from Western Europe...so perhaps the 5.9 take into account more locations?
Based on what I have seen I have to believe something is flawed in the 5.9 average, 0.8 stdev assumption. Are 34% of the erect penises you see between 5.1 and 5.8? No, the number in that range is much smaller than 34%, right?
I think the average is higher. The deviation may also be higher, or what I actually suspect is that the distribution is not strictly normal but rather has more erection lengths on the higher ends than on the lower end.
All of that being said, I don't keep my ruler handy for measuring cocks every time I see one lol. And, of course, what really matters if we are looking for a partner is whether the guy is a nice guy, not the size of his cock. Even when we are looking for sex partners, what matters most is compatibility, not cock size.