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Female genital mutilation (lets use its proper term) has no positive effects whatsoever, but a plethora of negative ones. It is simply mutilation. It is barbaric and inhuman, and any civilized country would charge it as aggravated assault.
But this is, if I recall correctly, not endemic to the Muslim world, but rather to certain cultures and nations.
Just to be fair.
The originator of this thread may find this practice as horrible as you.