Sep 2, - Yes, that's right, ladies and gents, a five-inch penis isn't small, but average. Minds the average penis size, when erect, is only to inches in length. For example, “X Marks the Spot,” and “The Splitter,” allow for deeper. Aug 10, - If your guy has an average penis, it will be smaller than the dollar bill, which measures 6 1/8 inches. If his penis comes to the end of the word.