Depending on how thin, and how old you are, it could be normal or abnormal. Guys do have thin penises and marry and have kids and enjoy sex. Get a piece of paper, wrap it around your erect penis when it's super-hard, mark the circumference, and then measure the paper to the mark. You might find out you're completely normal (The average of all adult erect penises is something like 4.5" circumference).
is it normal that my penis is so thin?
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Depending on how thin, and how old you are, it could be normal or abnormal. Guys do have thin penises and marry and have kids and enjoy sex. Get a piece of paper, wrap it around your erect penis when it's super-hard, mark the circumference, and then measure the paper to the mark. You might find out you're completely normal (The average of all adult erect penises is something like 4.5" circumference).