Yo creo que esta anomalía como todas se da por un conjunto de factores, entre ellos pueden confluir NO EXCLUYENTEMENTE factores genéticos, biológicos, ambientales y psicológicos. Existen muchas investigaciones al respecto y creo que además que sacar conclusiones en base a 1 sólo estudio es apresurado y digno de mi desconfianza. Sobre todo si tu información la extraes de un sitio como Ambiente G (una página gay)http://www.ambienteg.com/integracion/la-adopcion-gay-no-afecta-al-desarrollo-del-nino...¿qué tipo de imparcialidad tiene tu información? Con este tipo de fuentes, qué seguridad me das de que estos resultados no fueron consecuencia de la parcialidad de los investigadores? Cómo me aseguras que el tamaño de la muestra no limita el grado en que pudieron extraerse conclusiones acerca de estos?. Las implicaciones de estos hallazgos para este modelo no deben ser extrapolados tan categóricamente si no poseemos información confiable.
Para el que quiera informarse de manera más confiable sobre los estudios existentes referentes a este tema les dejo un par de fragmentos y una lista de investigaciones y revisiones sistemáticas publicadas en sitios como el de la revista Science y Brain una revista de neurología de la Universidad de Oxford.
Who do we think we are? The brain and gender identity.J. Herbert (2008)
Brain 131, 3115-3117
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Aquí esta el abstrac del paper que se cita en el fragmento anterior.
Otras publicaciones sobre el tema:
A sex difference in the hypothalamic uncinate nucleus: relationship to gender identity.A. Garcia-Falgueras and D. F. Swaab (2008)
Brain 131, 3132-3146
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PDF » Patterns of Brain Activation during Visually Evoked Sexual Arousal Differ between Homosexual and Heterosexual Men.S.-h. Hu, N. Wei, Q.-D. Wang, L.-q. Yan, E.-Q. Wei, M.-M. Zhang, J.-B. Hu, M.-l. Huang, W.-h. Zhou, and Y. Xu (2008)
AJNR Am. J. Neuroradiol. 29, 1890-1896
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PDF » Male-to-Female Transsexuals Show Sex-Atypical Hypothalamus Activation When Smelling Odorous Steroids.H. Berglund, P. Lindstrom, C. Dhejne-Helmy, and I. Savic (2008)
Cereb Cortex 18, 1900-1908
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PDF » Sexual orientation and its basis in brain structure and function.D. F. Swaab (2008)
PNAS 105, 10273-10274
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PDF » Sexual Differentiation of Behavior: The Foundation of a Developmental Model of Psychosexuality.R. C. Friedman and J. I. Downey (2008)
J Am Psychoanal Assoc 56, 147-175
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PDF » Socially induced brain differentiation in a cooperatively breeding songbird.C. Voigt, S. Leitner, and M. Gahr (2007)
Proc R Soc B 274, 2645-2652
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PDF » The Ovine Sexually Dimorphic Nucleus of the Medial Preoptic Area Is Organized Prenatally by Testosterone.C. E. Roselli, H. Stadelman, R. Reeve, C. V. Bishop, and F. Stormshak (2007)
Endocrinology 148, 4450-4457
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PDF » From the Cover: Biological versus nonbiological older brothers and men's sexual orientation.A. F. Bogaert (2006)
PNAS 103, 10771-10774
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PDF » O brother, where art thou? The fraternal birth-order effect on male sexual orientation.D. A. Puts, C. L. Jordan, and S. M. Breedlove (2006)
PNAS 103, 10531-10532
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PDF » Brain response to putative pheromones in lesbian women.H. Berglund, P. Lindstrom, and I. Savic (2006)
PNAS 103, 8269-8274
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PDF » Brain, Sex and Ideology.C. Vidal (2005)
Diogenes 52, 127-133
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PDF » II. Constantinople (1973) and the Legacy of Empirical Feminism.F. Pratto (2005)
Feminism Psychology 15, 415-423
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PDF » Gender Identity and Psychosexual Disorders.K. J. Zucker and S. J. Bradley (2005)
Focus 3, 598-617
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PDF » Brain response to putative pheromones in homosexual men.I. Savic, H. Berglund, and P. Lindstrom (2005)
PNAS 102, 7356-7361
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PDF » Brain Aromatase: Dyed-in-the-Wool Homosexuality.J. A. Morris, K. L. Gobrogge, C. L. Jordan, and S. M. Breedlove (2004)
Endocrinology 145, 475-477
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PDF » The Volume of a Sexually Dimorphic Nucleus in the Ovine Medial Preoptic Area/Anterior Hypothalamus Varies with Sexual Partner Preference.C. E. Roselli, K. Larkin, J. A. Resko, J. N. Stellflug, and F. Stormshak (2004)
Endocrinology 145, 478-483
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PDF » Drowning in a Sea of Estrogens: Sex Hormones, Sexual Reproduction and Sex.C. Roberts (2003)
Sexualities 6, 195-213
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PDF » Transsexual and Transgenderist Experiences and Treatment Options.K. M. Ellis and K. Eriksen (2002)
The Family Journal 10, 289-299
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PDF » Birth Order, Birth Interval, and Deviant Sexual Preferences Among Sex Offenders.K. Cote, C. M. Earls, and M. L. Lalumiere (2002)
Sexual Abuse: A Journal of Research and Treatment 14, 67-81
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PDF » Constructing the 'Gay Gene' in the News: Optimism and Skepticism in the US and British Press.P. Conrad and S. Markens (2001)
Health (London) 5, 373-400
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PDF » Sexual Hypnotherapy for Couples and Family Counselors.D. Araoz, J. Burte, and E. Goldin (2001)
The Family Journal 9, 75-81
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PDF » Same-Sex Sexual Behavior and Psychiatric Disorders: Findings From the Netherlands Mental Health Survey and Incidence Study (NEMESIS).T. G. M. Sandfort, R. de Graaf, R. V. Bijl, and P. Schnabel (2001)
Arch Gen Psychiatry 58, 85-91
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PDF » Gender identity disorder in young people.D. Di Ceglie (2000)
Adv. Psychiatr. Treat. 6, 458-466
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Full Text » Male-to-Female Transsexuals Have Female Neuron Numbers in a Limbic Nucleus.F. P. M. Kruijver, J.-N. Zhou, C. W. Pool, M. A. Hofman, L. J. G. Gooren, and D. F. Swaab (2000)
J. Clin. Endocrinol. Metab. 85, 2034-2041
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Full Text » Consuming Compassion: AIDS, Figure Skating, and Canadian Identity.S. King (2000)
Journal of Sport and Social Issues 24, 148-175
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PDF » Constructing sexual citizenship: theorizing sexual rights.D. Richardson (2000)
Critical Social Policy 20, 105-135
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PDF » A brain sexual dimorphism controlled by adult circulating androgens.B. M. Cooke, G. Tabibnia, and S. M. Breedlove (1999)
PNAS 96, 7538-7540
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PDF » Reductionistic Biological Thinking and the Denial of Experience and Pain in Developmental Theories.A. Gruen (1998)
Journal of Humanistic Psychology 38, 84-102
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Abstract » Comparison of the auditory systems of heterosexuals and homosexuals: Click-evoked otoacoustic emissions.D. McFadden and E. G. Pasanen (1998)
PNAS 95, 2709-2713
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PDF » Sexual Deviance and Number of Older Brothers Among Sexual Offenders.M. L. Lalumiere, G. T. Harris, V. L. Quinsey, and M. E. Rice (1998)
Sexual Abuse: A Journal of Research and Treatment 10, 5-15
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PDF » Pubertal Age in Homosexual and Heterosexual Sexual Offenders Against Children, Pubescents, and Adults.R. Blanchard and R. Dickey (1998)
Sexual Abuse: A Journal of Research and Treatment 10, 273-282
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PDF » Effects of Pesticides and Toxic Substances On Behavioral and Morphological Reproductive Development: Endocrine Versus Nonendocrine Mechanisms.L. E. Gray JR and J. Ostby (1998)
Toxicology and Industrial Health 14, 159-184
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PDF » Materializing the Hypothalamus: A Performative Account of the `Gay Brain'.P. Hegarty (1997)
Feminism Psychology 7, 355-372
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Abstract » Sex Reassignment at Birth: Long-term Review and Clinical Implications.M. Diamond and H. K. Sigmundson (1997)
Arch Pediatr Adolesc Med 151, 298-304
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PDF » Occasional Series Why women?.M. Lockshin (1997)
Lupus 6, 625-632
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PDF » Perverting Evolutionary Narratives of Heterosexual Masculinity: Or, Getting Rid of the Heterosexual Bug.M. McCaughey (1996)
GLQ: A Journal of Lesbian and Gay Studies 3, 261-287
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PDF » Introducing the `gay gene': media and scientific representations.D. Miller (1995)
Public Understanding of Science 4, 269-284
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PDF » Genetic and Cytogenetic Intersex Anomalies: Can They Help Us to Understand Gender Differences in Deviant Behavior?.A. Walsh (1995)
Int J Offender Ther Comp Criminol 39, 151-166
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PDF » Over Our Dead Bodies: The Scientific Construction of Gay Biology.C. Kitzinger (1995)
Theory Psychology 5, 309-311
Genetic feminization of brain structures and changed sexual orientation in male Drosophila.J. Ferveur, K. Stortkuhl, R. Stocker, and R. Greenspan (1995)
Science 267, 902-905
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PDF » Evolutionary Perspectives on Sexual Offending.V. L. Quinsey and M. L. Lalumiere (1995)
Sexual Abuse: A Journal of Research and Treatment 7, 301-315
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PDF » Homosexuality.R. C. Friedman and J. I. Downey (1994)
N. Engl. J. Med. 331, 923-930
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Full Text » Psychoanalysis, Psychobiology, and Homosexuality.R. C. Friedman and J. Downey (1993)
J Am Psychoanal Assoc 41, 1159-1198
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PDF » A linkage between DNA markers on the X chromosome and male sexual orientation.D. Hamer, S Hu, V. Magnuson, N Hu, and A. Pattatucci (1993)
Science 261, 321-327
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PDF » Human Sexual Orientation: The Biologic Theories Reappraised.W. Byne and B. Parsons (1993)
Arch Gen Psychiatry 50, 228-239
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PDF » Evidence for Queer Genes: An Interview with Richard Pillard.E. Stein (1993)
GLQ: A Journal of Lesbian and Gay Studies 1, 93-110
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PDF » Twin study links genes to homosexuality.C Holden (1992)
Science 255, 33
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PDF » DOES MALE HOMOSEXUALITY HAVE A BIOLOGIC BASIS. (1991)
Journal Watch (General) 1991, 8
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Full Text » Is homosexuality biological?.M Barinaga (1991)
Science 253, 956-957
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PDF » Saludos