Goodness, this should have been a simple response. Big Al. BigDalllas, and Headjelquer are your best answers so far. Drugs, however natural, are unnecessary. Any tissue looks and responds better to increased vascularity throughout. Increasing the strength of your penis, blood flow, vein capacity will all improve this look. Remember that blood flows into the penis where it is basically trapped. There is increased pressure on the veins to hold the blood without turning over CO2. I'll pause here for the appreciation of the human body and how difficult this is. This is hwhy doing things such as clamping and rubber-banding work so well. They support the dorsal vein (if I'm wrong about this vein please don't get handy. You get the idea) and its efforts to hold blood in the penis. Do exercises such as jelquing, clamping, stretching, clamping, stamina work such as PC exercises with weights, etc. are all ways to achieve this goal. The penis doesn't respond like a muscle (it responds better), but the basic premise for muscle growth through cell expansion is still effective. Cells in the penis will grow through increasing their volume capacity as well as rips and recovery that leave larger cells. The penis' cell capacity, however, is trickier in that it is very limited. It is believed that methods such as pumping can not create new cells for a yet to be discovered reason and that traditional methods such as jelquing are effective for this reason. Sorry, I'll stop here. Damn tangents. I'm not even sure if I answered your question by the end.