Penis Hard But Not To Full Potential?

chriswatson

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It's something that sometimes happens to me and I am wondering why and if it happens to others too.

Sometimes when my penis is erected and hard, it's not to its full potential...

What I mean by that is, when it's hard it obviously grows in length, thickness and also the head grows bigger. However, certain times, when I'm hard, it grows but the thickness is less, the head sometimes doesn't grow and stays the same size as when soft... like it's super hard as usual but it's not as big/thick/long as it should be.

Why?