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http://www.glbtss.colostate.edu/faqs/might-be-bisexual.asp

http://www.dailycal.org/sharticle.php?id=19110

http://www.yawningbread.org/arch_2006/yax-544.htm

http://www.geneticarchaeology.com/Research/The_Genetics_of_Bisexuality.asp

http://en.wikipedia.org/wiki/Biology_and_sexual_orientation