Mine is not only extremely dark, but has a crease of fused skin, that evidently didn't fuse very well, almost looks like a small seam of skin. Think of labia minora fused and only being a millimeter, running the full length of the underside if my penis and under my scrotum. A sign of some sort of intersex condition, I'm not sure. I didn't know all penises were like mine until I read that page on Wikipedia last month lol.