What is the average penis size for 15. This suggests that the penis would appear to be shorter when there is more fat under the skin at the visible base of the penis. June 17, Reply. April 8, Reply. Pls I need help. MNT is the registered trade mark of Healthline Media. Daniel, It is still considered normal to begin puberty at mature home made tube, but your concern would be a good reason to have a physical exam and honest discussion with your pediatrician. Please keep that in mind when reading my comments and replies. Not Dr. I could not even come close to using a condom.