Science Does Not Support the Claim That Homosexuality Is Genetic
BORN OR BRED?
By Robert Knight
The debate over homosexual “marriage” often becomes focused on whether homosexuality is a
learned behavior or a genetic trait. Many homosexual activists insist that “science” has shown
that homosexuality is inborn, cannot be changed, and that therefore they should have the “right
to marry” each other.
Beginning in the early 1990s, activists began arguing that scientific research has proven that
homosexuality has a genetic or hormonal cause. A handful of studies, none of them replicated
and all exposed as methodologically unsound or misrepresented, have linked sexual orientation
to everything from differences in portions of the brain,1,2 to genes,3 finger length,4 inner ear
differences,5 eye-blinking,6 and “neuro-hormonal differentiation.”7
Meanwhile, Columbia University Professor of Psychiatry Dr. Robert Spitzer, who was
instrumental in removing homosexuality in 1973 from the American Psychiatric Association’s
list of mental disorders, wrote a study published in the October 2003 Archives of Sexual
Behavior. He contended that people can change their “sexual orientation” from homosexual to normal.
1 D.F. Swaab and M.A. Hofman, Brain Res. 537 (1990): 141-48, as cited in Dennis McFadden and E.G. Pasanen, “Comparisons
of the auditory systems of heterosexuals and homosexuals: Click-evoked otoacoustic emissions,” Proceedings of the National.
Academy of Science USA 95 (March 1998): 2709-13.
2 Simon LeVay, “A Difference in Hypothalamic Structure Between Heterosexual and Homosexual Men,” Science Vol. 253
3 D.H. Hamer, S. Hu, V.L. Magnuson, N. Hu and A.M.L. Pattatucci, Science 261(1993): 321-27, as cited in McFadden.
4 B.J. Sigesmund, “Let Your Fingers Do the Talking,” Newsweek “Web Exclusive,” 31 March 2000.
5 McFadden and Pasanen.
6 “Sexual orientation ‘hard-wired’ before birth – startling new evidence revealed in the blink of an eye,” press release, University
of East London (UEL), England, October 2, 2003, reporting on findings by the UEL’s Dr. Qazi Rahman, along with the Institute
of Psychiatry’s Dr. Veena Kumari and Dr. Glenn Wilson. In terms of eye-blink reactions to sudden loud noises, “The team
discovered significant differences in the response between male and female, and heterosexual and homosexual subjects.”
Rahman: “The startle response is pre-conscious and cannot be learned.”
7 Qazi Rahman, “Comments on the Neuroanatomy of Human Sexual Orientation and Proposed Neuroendocrine Hypotheses,”
Contemporary Neurology (1999): Number 2A: http://mitpress.mit.edu/jrnls-catalog/cont-neuro.html.