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As far as sperm banks go, that's an extremely new phenomenon. There would be absolutely no evolutionary impetus for human males to utilize those facilities, because no one's ancestors
http://www.quora.com/Biology-1/Why-isnt-donating-s...
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Sperm is collected by the donor
http://www.chacha.com/question/what-method-do-they...
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Using an annoynmous source may make your story seem less
http://www.chacha.com/question/what-is-one-danger-...
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