Drnos...If I may:
Outside the sexual sphere, the navel has caused something of a problem in religious circles. For those that believe in the actual "literal truth" of the religious texts (Bible, Quar'an, etc), the navel poses a real problem....whether or not the first humans had them. Early artists usually painted them in when they painted Adam and Eve in the garden but why?
If we say "God created man in his own image", then surely God has a belly button too, right?
If we say, that Adam and Eve didn't have one, then we must agree that humans actually DO evolve...and ARE evolving, right?
That's one of the questions that has stumped theologists for decades.......
The Turks have a legend that says that after Allah created man, the Devil was so angry that he spat on the man, and God quickly snatched out the polluted skin....
Buddhist Ascetics see the belly button as the center of the universe, and this is where the phrase "contemplate one's navel" comes from. It's not saying that you are conducting a self-centered, inward-looking form of meditation, but rather comtemplating the entire universe.
I believe one day we won't have them.
That's too bad because I like belly buttons......