Why do some girls have vertical navel?

[Anonymous]

I know men like it, but where is it from?
Can only a plastic abdominal operation cause it?
Is it because of a shape of muscles or a bone stracture?
Why only women have it?
Why is it so rare?
If you know something about it, please share with me

[miguel_angel]

I think since it is elongated it makes your tummy to look toned which is sexy, if it were not toned probably you would not have a vertical navel! Also being vertical is pretty unique which is hard to find and sexy!

[aceexp]

I don't know, I would assume it's because women in general have longer torsos so it just adjusts itself.

[Malita55]

If its what in the picture i dont like it, looks sickly