An uncircumcised penis retains the foreskin, which covers the head of a nonerect penis. When the penis is erect, the foreskin pulls back to reveal the glans. A circumcised penis has no foreskin, which exposes the glans when the penis is both erect and nonerect.

Is uncircumcised good or bad?

Not at all! Circumcision — the removal of the foreskin on the penis — is generally done shortly after birth. About 60 percent of boys in the U.S. are circumcised at birth, which means that 40 percent are uncircumcised.

What age should you be able to pull your foreskin back?

Most boys will be able to retract their foreskins by the time they are 5 years old, yet others will not be able to until the teen years. As a boy becomes more aware of his body, he will most likely discover how to retract his own foreskin. But foreskin retraction should never be forced.