The majority of men are content with the size and appearance of their genitalia, but around 45 percent express some level of dissatisfaction. When considering penis size, many wonder about the average measurements and whether penis size is genetically determined. Typically, men possess an average penis size ranging from about 5.5 to 6.2 inches in length when erect. While these measurements fall within the normal range, some individuals still feel their dimensions are insufficient, leading to feelings of inadequacy or "penis envy."