Why are people gay? There's lots of science regarding what the causes of homosexuality might be and in a series of videos I'm going to talk about them one by one. In this video I'm explaining the fraternal birth order effect.
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Anthony F. Bogaert, Malvina Skorska (2011) Sexual orientation, fraternal birth order, and the maternal immune hypothesis: A review, Frontiers in Neuroendocrinology 32, 247–254, 2011
Brian S. Mustanski , Meredith L. Chivers & J. Michael Bailey (2002) A Critical Review of Recent Biological Research on Human Sexual Orientation, Annual Review of Sex Research, 13:1, 89-140
James M. Cantor, Ph.D., Ray Blanchard, Ph.D., Andrew D. Paterson, M.B., Ch.B., and Anthony F. Bogaert, Ph.D. (2000) How Many Gay Men Owe Their Sexual Orientation to Fraternal Birth Order?, Archives of Sexual Behavior, Vol. 31, No. 1, 63–71, February 2002
Ray Blanchard and Anthony F. Bogaert (1996) Homosexuality in men and number of older brothers, American Journal of Psychiatry 153(1):27-31, February 1996
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