Perception is much more important than a number. If your dick is perceived as amazing, then that's that, isn't it? If you have a girlfriend and she is saying "your dick is the biggest I've ever seen" and she actually isn't lying, then what's a number? So that you can know what percentile your are of the population? I mean, take me, I asked if my girl had seen bigger. She was like "yup", and I was like "damn". Then she told me she'd had a boyfriend who had a 13" dick, and it was the worst sex she'd ever had. We need to get our heads out of our own dick-asses. Guys aren't satisfied with the size of their dicks until they hurt they girl they're with. Then they're like "aww yiss", while the girl isn't having a good time. The fuck. Also, not all girls ride anacondas like in porn.
This need to measure is silly. It's not the measurement of a man. It's just the size of his dick.