If penis size doesn't matter, why is there such little variation in penis size?
Logic dictates that the less size is important the greater the range we'd expect to see. We would also expect to see a greater spread across the whole size range. That is if penises ranged from 1 to 10inch we'd expect 10% of men to fall in each inch category.
But we DON'T. The average size is 5.5 and the vast majority of men fall within one inch of this. This regulatory can only have evolved if penis size was important.
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