National Center for Biotechnology Information, U. Pornography, in which male performers are often selected for their extremely large genitalia, may be partly to blame. To play it safe, you might want to visit your gyno to rule out any medical problems, such as cysts or infections. Studies that have relied on self-measurement, including those from Internet surveys, consistently reported a higher average length than those that used medical or scientific methods to obtain measurements. The study was part of a larger research project dealing with condom fitting. Find out more about penis enlargement treatments.