I am a 169 lb. white 17 year old. It started about 1 or 2 years ago maybe. My testicles have become oily, and increasingly adhesive. This is the same way for the bottom side of my penis. My penis shaft has darker skin on the bottom half of my shaft all the way around. The top half is soft and white, yet when you move down to the darker skin, it feels thicker and harder almost leather-like. There is also a much smaller sensation on the brown part of the shaft. My penis used to be all white and a soft texture. What could this be?
It's normal for the skin of the penis to change color as you get older, and variations in penis skin color are normal. Desensitization of the skin can also be caused by aggressive masturbation. There's not much you can do about the skin color, but you can make sure it is as healthy as possible and doesn't lose sensation by using a penis health creme (Man1 Man Oil is a good brand, or google for others).