Why are the genitals of humans much darker than the rest of our bodies?

Question

My own genitals are way darker than the rest of my body but I didn’t really think anything of it until it somehow crossed my mind again. For reference: I went to the local public swimming pool and while showering noticed that this was universal for everh male

Edit: The skin on the very tip is particularly dark. The foreskin that is. There’s a distinct color change.

In: 11

Answer 1

[removed]