It is already done and it failed miserably. It is called Amazon women. They become legend even they are real. Amazon women disappear to extinction or irreverent when Christamity or Islam took over, or got killed to extinction by another tribes.
Same amazon woman cut her breast cause they think it will improve arrow shooting. And it did not work very well.
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@Van why they heck you delete my comment about gay marraige and furry comment on straw hat crew mates thread.
Btw I am right wing since 2010 .