The Galton hypothesis had been discussed in 2013 with great debate, and several studies lead to know it for sure. Yes people do studies when they are in the process of creating the next iso standard for male birth control and std protection.

And... No... It really seem Gaussian, that's what Veale seemed to have shown and also the conclusion of calcsd somewhere in their website is a discussion about their own database figures.

What might mistake people is the lack of measurement standard amongst people self measuring. Most guys use tape measures for the extra couple of inches it provides compared to a stainless ruler. And the latest Italian study by Di Mauro's team showed pretty well that even without the will to cheat, with the proper tools and methodology, figures twist upwards dramatically when self obtained ( 1.2" above the average obtained by their team measuring the same group)...

What the standard set by Veale and iso 4074 group for condom makers seem to show is a narrower bell curve than we used to think. The latest french condom maker symposium showed an average at 13.86 and a SD of 1.54 with only 16 cases below avg-2 SD and 22 above AVG 2 SD on a sample of over 5600 measures provided by trained urologists using pictures as proof... That's less than 4 guys per 1000 above 7 real (related to the way averages are made so they can be compared together) inches.

The debate on non comparable to average expressed sizes is growing too, maybe that will do some change too