So what do us men have?
We have an organ that can go through metamorphosis—it can change in size, shape, heat, and geographic orientation. Not only that but it is arguably the premiere source of male identity, more so than any other single organ.
The penis is multi-faceted but when talking about an erection, the most important parts of the organ are the three empty cylinders patiently waiting to be filled with blood. A man’s stiffness is brought on when the ratio of blood entering and exiting the penis shifts, that is, when more blood comes in and less blood goes out. This is a result of nature itself. Excitement increases blood flow, which in turn expands the penile girth and ultimately compromises the exit route for that same blood, trapping it inside the penis. The penis’ girth expands as the blood fills its many cavernous spaces, it also facilitates the narrowing of the exit path to the penile vein. So the more blood that flows into the penis, the firmer the exit lock tightens, a crucial point that we will revisit.
But wait, what is a penis? Before we get into its many feats and functions, let’s first understand what exactly it is. The penis is a biological feature and the reproductive organ of male animals that is made up of three parts: the root, which is bound to your body by the wall of your abdomen; the shaft; and the glans.
Comprised of connective and erectile tissue, the shaft of the penis is the length that which extends outward from the body, ending with the glans or the head. The glans are covered by a loose fold of skin that most of us refer to as foreskin. When present, this skin retracts from the glans upon arousal and then drapes back over it when the penis returns to a flaccid state. Circumcision, however, surgically removes this skin and results in a dick with an altogether different soft appearance. Studies have suggested that circumcised or not, there is equal sensitivity for men at the glans of the penis. And like the rest of the cock, the glans are teeming with nerves, making them a key contributor to the quality of your sexual encounter.
Additionally, arteries run long and wide within the penis and carry blood to smaller capillaries, giving access to every nook and cranny and providing you with that rock hard affirmation. The interior of the penis has three channels: the corpus spongiosum, or for the sake of this explanation, channel A, which runs along the underside of the penis and holds the urethra; and the two corpora cavernosa, channels B and C, which run side-by-side along the top of the penis. In an erection, channel A prevents the urethra from contracting shut, thereby making it a practical duct for ejaculation. Channels B and C, however, don’t just make way for an erection, they are the erection. These expandable erectile tissues hold most of the blood during arousal and run from the pubic bone to the glans, at which point they converge. It is within each of these channels that you find a honeycomb-like maze of spaces called trabeculae, which engorge with blood when the penis becomes erect.