Interesting article. I mean, I got sidetracked after reading it and one poster's comment on Naval microfluid research, but that's beside the point. I don't particularly look at a womans umbilicus when determining physical attractiveness, but I do look at her belly, and more prominently, the sides of it; ie, the "hourglass" shape. I do not know why, by a slight inner curve to a females figure is about the most physically attractive part to me. Not as for most, the breasts or butt, but figure.
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I am Jon Stewart with some Colbert cynicism, Thomas Edison's curiousity, wrapped around a hardcore gamer sprinkled very liberally with Deadpool, and finished off with an almost Poison Ivy-esque love/hate relationship with humanity flourish.