Seriously. My penis is a dark chocolate. I am spanish with light brown to medium brown skin. My cock is deep chocolate. IMO, it kind of looks funny in comparison to the rest of my body. Is this normal?
The colour of the penis, especially the glans, becomes darker the more sex experience you have.
You must have the disease called "Eggplantius Dickosa." I hear that it's very common among Mediterranian men.
There was a good answer earlier; its because of melanin.
Do you tan easily? I do, because of my Italian heritage. Which means I have more melanin than most (I think?). Therefore my penis is dark.
Similar to the colour I tan.