Researchers have found that size does matter as it relates to overall proportions of the male body (PNAS link, PDF)
One of the results of unlimited internet porn is that guys invariably compare their own members to those they see on the net. And lots of them aren't happy.
Why is the penis shaped like that? [T]he human penis is actually an impressive “tool” in the truest sense of the word, one manufactured by nature over hundreds of thousands of years of human evolution. You may be surprised to discover just how highly specialized a tool it is. Furthermore, you’d be amazed at what its appearance can tell us about the nature of our sexuality.
Sexual ornaments grow out of all proportion It seems that men will be men throughout the animal kindom, not just our little lonely corner of of it. Most body parts grow proportionally with the rest of the body as individuals of a species become larger, although scientists have long known that visual cues of reproductive prowess are a special case. But is this the case with everyone?
Micro-penis sufferers, rejoice!