I've had one since before I had kids. I am, uh, "naturally tan" however, so it might have something to do with my pigmentation
When I'm pregnant, it gets darker. It runs from my belly button to my pubic bone and up from my belly button too. I have one now, not that I can see my own belly to know though LOL
Namaste, Tara
mama to Doodle (7), Butterfly (2), and Rythm (due at home 1/06)