• Many think of the panis length as determining the size of the penis. However, the right way of determining the size of a penis is by volume. A shorter penis with a big volume will look and be bigger than a longer penis with a smaller volume. Also the penis size is qualified by it's girth, because it will be the main factor of producing pleasure to your partner. So the next time someone says the size of a penis is a result of its length, you shall correct them.