you can enhance your penis by cutting the muscles that hold its your abdomen, its the reason why when you have a wood you could piss in your face. This usually adds about an inch in length. Its relatively easy and low in complications as your only cutting the muscle which in turn lets your penis out of your body as there is something like 2inches or more inside your body. One issue is your boner becomes less stable and will point down, like a porn star.
As for girth you can inject fact which is simple as well, problem is the fat in the end starts to migrate and lump. You can also add like a mesh around your penis but this means cutting your cock and almost unwrapping it. They then add this medical bio mesh which adds girth. It works but theres lot of problems.
In the end porn is not your average man, to top it off they use effects such as close ups which makes things look bigger plus penis pumping before a scene. The average male penis erect is only 5.5 inches. so anything over that your better than average. Average flacid is around 3in. The smaller the penis in flacid state the larger it will be erect. I.E if you have a 3incher and your buddy has a 5 soft chances are he will be smaller than you.
How do I know all of this, had to write a paper about it once on surgical enhancements.