Girls, whenever I see a female belly button it's always dark in the middle why?

Belly_buttons_rock
For guys it's never dark but for girls it's always dark inside their belly button and looks deep... Why do us guys belly buttons you can see the inside of their belly button and with girls you can't see anything in the middle of their belly button
Updates:
+1 y
by the way innie belly button not outie but here is what I'm talking about
1.img-aws.ehowcdn.com/.../...button-lint-800x800.jpg
2.blogs.discovermagazine.com/.../bellybutton.jpg
Girls, whenever I see a female belly button it's always dark in the middle why?
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