Prefer females cause almost every asian language uses a "light" tone in their speaking so it wouldn´t work so well when there stands a male singer singing a "light-toned" song
But it seems that the cantonese got no problem with this
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どぞ よろしく おねがいします
Born By The Sword, Die By The Sword
The Fear For Blood Tends To Create Fear For The Flesh
~Yours Sincerely MortalSex