Siren voice means she's fertile

A woman raises the pitch of her voice during her most fertile period of the month in an unconscious boost to her femininity, according to a study published Wednesday in the British journal Biology Letters.

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<p><a href="http://www.physorg.com/news142655309.html">Siren voice means she's fertile</a></p> <p>A woman raises the pitch of her voice during her most fertile period of the month in an unconscious boost to her femininity, according to a study published Wednesday in the British journal Biology Letters. </p>