How deep is the average belly button? - Quora

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Why is my belly button deep? - Quora

Why are guys so obsessed with belly buttons? - Quora

How deep is your navel? What kind of belly button experiences have you had? - Quora

Which woman has world's deepest belly button? - Quora

Does a 12-year-old boy have a belly button? - Quora

What is the best way to show off your belly button? - Quora

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Is a horizontal belly button unattractive? - Quora