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== Making the foreskin retractable ==
Teen boys who still have a non-retractable foreskin (about 10 percent of boys) should start stretching exercises to make the foreskin retractable in preparation for adult life.
Occasionally a male reaches adulthood with a non-retractile foreskin. Some men with a non-retractile foreskin happily go through life and father children. Other men, however, may want to make their foreskin retractile.