The foreskin on my penis doesn't retract. i am 18 yrs old. i do masturbate and have a good sperm count. what shall i do?

It's important for genital health that the foreskin retract. You'll need evaluation by a urologist, and likely a minor surgical procedure to enlarge the foreskin opening and allow retraction. Good luck.

Phimosis is likely and topical treatment/ circumcision is typically done in such circumstances. Start with your primary doc for an exam.

Agree with Dr. P. Do not try to force the foreskin to retract. See your doctor as you may need a circumcision. If will not affect your reproductive ability or sexual pleasure. Wish you good health!

you have two choices. everyday retract the well lubricated foreskin back as far back as it does not cause pain then pull it forward again. try this daily and over time your foreskin might become supple. make sure to keep it forward when finished. The faster way is have a circumcision.