After two months of my PE , I did not measure or see my erect penis carefully. Then I see it in the mirror and it appeared about 1/2” longer to me. I measured it with a scale for the first time after starting PE. I gained 3/4” , more than my guess.
The 1” length difference between two penises should be as conspicuous as the height difference between persons having 5’ 6” and 6’6” height.