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Is my foreskin normal? How does it work?

mr-nemesis
asks:
I am 16 years old: when erect only half of the tip of my penis shows. I was just wondering if this is normal? I thought that when your penis is erect that the entire tip is exposed, then when non-erect the foreskin retracts to protect the tip? Am I right or wrong? When will my full tip come out? Or do I have to pull my foreskin back during intercourse? Thanks! ...