Homosexuality, Birth Order, and Evolution: Toward an Equilibrium Reproductive Economics of Homosexuality
- Edward M. Miller
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The survival of a human predisposition for homosexuality can be explained by sexual orientation being a polygenetic trait that is influenced by a number of genes. During development these shift male brain development in the female direction. Inheritance of several such alleles produces homosexuality. Single alleles make for greater sensitivity, empathy, tendermindedness, and kindness. These traits make heterosexual carriers of the genes better fathers and more attractive mates. There is a balanced polymorphism in which the feminizing effect of these alleles in heterosexuals offsets the adverse effects. (on reproductive success) of these alleles' contribution to homosexuality. A similar effect probably occurs for genes that can produce lesbianism in females. The whole system survives because it serves to provide a high degree of variability among the personalities of offspring, providing the genotype with diversification and reducing competition among offspring for the same niches. An allele with a large effect can survive in these circumstances in males, but it is less likely to survive in females. The birth order effect on homosexuality is probably a by-product of a biological mechanism that shifts personalities more in the feminine direction in the later born sons, reducing the probability of these sons engaging in unproductive competition with each other.
Alexander, J. E., and Sufka, K. J. (1993). Cerebral lateralization in homosexual males? A preliminary EEG investigation. Int.J.Psychophysiol.15: 269–274.
Allen, L. S., and Gorski, R. A. (1992). Sexual orientation and the size of the anterior commissure in the human brain. Proc.Natl.Acad.Sci.USA.89: 7199–7202.
Bailey, J. M., and Martin, N. G. (1995). A twin registry study of sexual orientation. Poster presentation at the International Academy of Sex Research, 21st Annual Meeting, Provincetown, MA.
Bailey, J. M., and Pillard, R. C. (1991).Agenetic study of male sexual orientation. Arch.Gen.Psychiatry48: 1089–1096.
Bailey, J. M., and Zucker, K. J. (1995). Childhood sex-type behavior and sexual orientation: A conceptual analysis and quantitative review. Dev.Psychol.31: 43–55.
Bailey, J. M., Pillard, R. C., Neale, M. C., and Agyei, Y. (1993). Heritable factors influence sexual orientation in women. Arch.Gen.Psychiatry50: 217–223.
Bailey, J. M., Finkel, E., Blackwelder, K., and Bailey, T. (1996). Masculinity, feminity, and sexual orientation (unpublished manuscript).
Bailey, J. M., Kim, P., Hills, A., and Linsenmeier, J. (1999). Butch, femme, or straight-acting? Partner preferences of gay men and lesbians. J.Pers.Soc.Psychol.73: 960–973.
Bailey, J. M., Dunne, M. P., and Martin, N. G. (in press). Genetic and environmental influences on sexual orientation and its correlates in an Australian twin sample. J.Pers.Soc.Psychol.
Baker, R., and Bellis, M. (1995.) Human Sperm Competition, Chapman and Hall, London.
Bakker, J., and Slob, A. K. (1997). Sexual differentation of the brain and partner preferences in the male rat: Behavioral, neuroanatomical and neuroimmunocytochemical studies. In Ellis, L., and Ebertz, L. (eds.), Sexual Orientation: Toward Biological Understanding, Praeger, Westport, CT, pp. 91–106.
Beer, J., and Horn, J. M. (1999). The influence of rearing order on personality development within two adoption cohorts. J.Personality(in press).
Bell, A. P., and Weinberg, M. (1978). Homosexualities: A Study of Diversity Among Men and Women, Simon and Schuster, New York.
Bell, A. P., Weinberg, M., and Hammersmith, S. (1981). Sexual Preference: Its Development in Men and Women, Indiana University Press, Bloomington.
Bianchi, D.W., Zickwolf, G. K., Weil, G. J., and Sylvester, S. (1996). Male fetal progenitor cells persist in maternal blood for as long as 27 years postpartum. Proc.Natl.Acad.Sci.USA93: 705–708.
Blanchard, R. (1997). Birth order and sibling sex ratio in homosexual versus heterosexual males and females. Annu.Rev.Sex Res.8: 27–67.
Blanchard, R., and Bogaert, A. F. (1996a). Biodemographic comparisons of homosexual and heterosexual men in the Kinsey interview data. Am.J.Psychiatry153: 27–31.
Blanchard, R., and Bogaert, A. F. (1996b). Homosexuality in men and number of older brothers. Arch.Sex.Behav.25: 545–573.
Blanchard, R., and Bogaert, A. F. (1998). Birth order in homosexual versus heterosexual sex offenders against children, pubescents, and adults. Arch.Sex.Behav.27: 595–603.
Blanchard, R., and Klassen, P. (1997). H-Y antigen and homosexuality in men. J.Theor.Biol.185: 373–378.
Blanchard, R., and Sheridan, P. (1992a). Proportion of unmarried siblings of homosexual and nonhomosexual gender-dysphoric patients. Can.J.Psychiatry37: 163–167.
Blanchard, R., and Sheridan, P. (1992b). Sibship size, sibling sex ratio, birth order, and parental age in homosexual and nonhomosexual gender dysphorics. J.Nerv.Ment.Dis.180: 40–47.
Blanchard, R., and Zucker, K. (1994). Reanalysis of Bell, Weinberg, and Hammersmith's data on birth order, sibling sex ratio, and parental age in homosexual men. Am.J.Psychiatry151: 1375–1376.
Blanchard, R., Zucker, K., Bradley, S. J., and Hume, C. (1995a). Birth order and sibling sex ratio in homosexual male adolescents and probably prehomosexual feminine boys. Dev.Psychol.31:22–30.
Blanchard, R., Zucker, Cohen-Kettenis, P., Gooren, L., and Bailey, J. M. (1995b). Birth order and sibling sex ratio in two samples of Dutch gender-dysphoric homosexual males. Arch.Sex.Behav. 25: 495–514.
Blanchard, R., Zucker, K., Siegelman, M., Dickey, R., and Klassen, P. (1998). The relation of birth order to sexual orientation in men and women. J.Biosoc.Sci. 30: 511–519.
Bogaert, A. F., and Blanchard, R. (1996). Physical development and sexual orientation in men: Height, weight, and age of puberty differences. Person.Indiv.Diff.21: 77–84.
Brim, O. G. (1958). Family structure and sex role learning by children: A further analysis of Helen Koch's data. Sociometry21: 1–16.
Buss, D. M. (1989). The Evolution of Desire, Basic Books, New York.
Buss, D. M. (1994). Sex differences in human mate preference: Evolutionary hypothesises tested in cultures. Behav.Brain Sci.12: 1–49.
Buss, D. M., and Barnes, M. (1994). Preferences in human mate selection. J.Pers.Soc.Psychol.50:559–570.
Chung, Y. B., and Harmon, L. W. (1994). The career interests and aspirations of gay men: How sex role orientation is related. J.Vocat.Behav.45: 223–239.
Cohen, D. B. (1999). Stranger in the Nest: Do Parents Really Shape Their Child's Personality, Intelligence, or Character?John Wiley & Sons, New York, p. 28.
Dorner, G., Rohde W., Stahl, F., et al.(1975). A neuroendocrine predisposition for homosexuality in men. Arch.Sex.Behav.4: 1–8.
Dorner, G., Schenck, B., Shmiedel, B., and Ahrens L. (1983). Stressful events in prenatal life of bi and homosexual men. Exp.Clin.Endocrinol Diabetes.81: 83–87.
Eaton, W., and Dureski, C. M. (1986). Parent and actometer measures of motor activity in the young enfant. Infant Behav.Dev.9: 383–393.
Eaton, W., Chipperfield, J., and Singbeil, C. (1989). Birth order and activity level in children. Dev.Psychol.25: 668–672.
Eaves, L. J., Eysenck, H. J., and Martin, N. G. (1989). Genes, Culture, and Personality, Academic Press, London.
Ellis, L. (1997). Perinatal influences on behavior and health, with special emphasis on sexual orientation and other sex-linked behavior. In Ellis, L., and Ebertz, L. (eds.), Sexual Orientation: Toward Biological Understanding, Praeger, Westport, CT, pp. 71–88.
Ellis, L., and Ames, M.A. (1987). Neurohormonal functioning and sexual orientation: A theory of homosexuality-heterosexuality. Psychol.Bull.101: 233–258.
Ellis, L., and Ebertz, L. (eds.) (1997). Sexual Orientation: Toward Biological Understanding, Praeger, Westport, CT.
Ellis, L., Ames, M. A., Peckham, W., and Burke, D. (1987). Sexual orientation of human offspring may be altered by severe maternal stress during pregnancy. J.Sex Res.25: 152–157.
Ellis, L., Hoffman, H., and Burke, D. M. (1990). Sex, sexual orientation and criminal and violent behavior. Person.Indiv.Diff.11: 1207–1212.
Eysenck, H. J., and Wilson, G. (1979). The Psychology of Sex, J. M. Dent and Sons, London.
Fauls, L. B., and Smith, W. D. (1956). Sex role learning of five-year-olds. J.Genet.Psychol.89:105–117.
Gallup, G., and Suarez, S. (1983). Homosexuality as a by-product of selection for optimal heterosexual strategies. Perspect.Biol.Med.26: 315–322.
Gandelman, R. (1992). Psychobiology of Behavioral Development, Oxford University Press, Oxford.
Getz, W. (1993). Invasion and maintenance of alleles that influence reproductive success. J.Theor.Biol.162: 515–537.
Gettelman, T. E., and Thomas, J. K. (1993). Actual differences and stereotypical perceptions in body image and eating disturbance: A comparison of male and female heterosexual and homosexual samples. Sex Roles29: 545–562.
Gladue, B. A., Green, R., and Hellman, R. E. (1984). Neuroendocrine response to estrogen and sexual orientation. Psychoneurorendocrinology20: 475–485.
Gladue, B. A., Beatty, W.W., Larson, J., and Staton, R. D. (1990). Sexual orientation and spatial ability in men and women. Psychobiology18(1): 101–108.
Goode, E., and Troiden, R. R. (1980). Correlates and accompaniments of promiscuous sex among male homosexuals. Psychiatry43: 51–59.
Gooren, L. J. G. (1986). The neuroendocrine response of luteinizing hormone to estrogen administration in heterosexual, homosexual, and transsexual subjects. J.Clin.Endocrinol.Metab.63: 588–593.
Gorman, M. R. (1994). Male homosexual desire: Neurological investigations and scientific bias. Perspect.Biol.Med.38(1).
Green, R. (1987). The “Sissy Boy Syndrome” and the Development of Homosexuality, Yale University Press, New Haven, CT.
Guadio, R. P. (1994). Sounding gay: Pitch properties in the speech of gay and straight men. Am.Speech69(1).
Hall, J. A. Y., and Kimura, D. (1994). Dermatoglyphic asymmetry and sexual orientation in men. Behav.Neurosci.108: 1203–1206.
Hall, J. A. Y., and Kimura, D. (1995). Sexual orientation and performance on sexually dimorphic motor tasks. Arch.Sex.Behav.24: 395–407.
Halpern, D. F., and Crothers, M. (1997). Sex, sexual orientation, and cognition. In Ellis, L., and Ebertz, L. (eds.), Sexual Orientation: Toward Biological Understanding, Praeger, Westport CT, pp. 181–197.
Hamer, D., and Copeland, P. (1994). The Science of Desire, Simon and Schuster, New York.
Hamer, D., and Copeland, P. (1998). Living with Our Genes, Doubleday, New York.
Hamer, D., Hu, S., Magnuson, V., Hu, N. and Pattatuci, A. (1993). A linkage between DNA markers on the X chromosome and male sexual orientation. Science261: 321–327.
Hu, S., Pattatuci, A., Patterson, C., Li, L., Fulker, D. W., Cherny, S., Kruglyak, L., and Hamer, D. (1995). Linkage between sexual orientation and chromosome Xq28 in males but not in females. Nature Genet.11: 248–256.
Jacklin, C. N., Maccoby, E., and Doering, C. H. (1983). Neonatal sex-steroid hormones and timidity in 6–18–month-old boys and girls. Dev.Psychobiol.16(3): 163–168.
Jones, M. B., and Blanchard, R., (1998). Birth order and male homosexuality: Extension of Slater's index. Hum.Biol.70: 775–787.
Kallmann, F. J. (1952). Comparative twin studies on the genetic aspects of male homosexuality. J.Nerv.Ment.Dis.115: 283–298.
Laumann, E., Gagnon, J. H., Michael R. T., and Michaels, S. (1994). The Social Organization of Sexuality: Sexual Practices in the United States, University of Chicago Press, Chicago.
LeVay, S. (1991). A difference in hypothalamic structure between heterosexual and homosexual men. Science253: 1034–1037.
LeVay, S. (1993). The Sexual Brain, MIT Press, Cambridge, MA.
LeVay, S. (1996). Queer Science: The Use and Abuse of Research into Homosexuality, MIT Press, Cambridge, MA.
Maccoby, E. E., Doering, C. H., Jacklin, C. N., and Kraemer,H. (1979). Concentrations of sex hormones in umbilical cord blood: Their relation to sex and birth order in infants. Child Dev. 50: 632–642.
MacIntrye, F., and Estep, K. W. (1993). Sperm competition and the persistence of the genes for male homosexuality. Biosystems31: 223–233.
McCormick, C. M., and Witelson, S. F. (1991). A cognitive profile of homosexual men compared to heterosexual men and women. Psychoneurorendocrinology16: 459–473.
McFadden, D., and Pasanen, E. G. (1998). Comparison of the auditory systems of heterosexuals and homosexuals: Click-evoked otoacoustic emissions. Proc.Natl.Acad.Sci.USA95: 2709–2713.
McGuire, T. R. (1995). Is homosexuality genetic? A critical review and some suggestions. J.Homosex.28(1/2): 115–144.
McKnight, J. (1997). Straight Science: Homosexuality, Evolution and Adaptation, Routledge, New York.
Mellen, S. L. (1981). The Evolution of Love, Freeman, San Francisco.
Miller, E. M. (1994). Prenatal sex hormone transfer: A reason to study opposite-sex twins. Person.Indiv.Diff.17: 511–529.
Miller, E. M. (1997a). Could nonshared environmental variance have evolved to assure diversification through randomness? Evol.Hum.Behav.18: 195–221.
Miller, E. M. (1997b). Evidence from opposite-sex twins for the effects of prenatal sex hormones. In Ellis, L., and Ebertz, L. (eds.), Males, Females, and Behavior: Toward Biological Understanding, Praeger, Westport, CT.
Moran, P. A. P. (1972). Familial effects in schizophrenia and homosexuality. Aust.N.Z.J.Psychiatry6: 116–119.
Murray, S. O. (1991). Homosexual occupations in Meso-America. J.Homosex.21: 57–65.
Perkins, M. W. (1981). Female homosexuality and body build. Arch.Sex.Behav.10: 337–345.
Pillard, R. C. (1991). Masculinity and femininity in homosexuality: “Inversion” revisited. In Gonsiorek, J. C., and Weinrich, J. D. (eds.), Homosexuality: Research Implications for Public Policy. Sage, Newbury Park, CA, pp. 32–43.
Pillard, R. C., and Weinrich, J. D. (1986). Evidence of familial nature of male homosexuality. Arch.Gen.Psychiatry43: 808–12.
Pillard, R. C., and Bailey, J. M. (1998). Human sexual orientation has a heritable component. Hum.Biol.347–365.
Plomin, R., Chipuer, H. M., and Neiderhiser, J.M. (1994). Behavior genetic evidence for the importance of nonshared environment. In Hetherington, E. M., Reiss, D., and Plomin, R. (eds.), Separate SocialWorlds of Siblings: The Impact of Nonshared Environment on Development, Lawrence Erlbaum, Hillsdale, NJ.
Prener, A., Hsieh, C., Engholm, G., Trichopoulos, D., and Jensen, O. (1992). Birth order and risk of testicular cancer. Cancer Causes Control3: 265–272.
Reite, M., Scheeder, J., Richardson, D., and Teale, P. (1995). Cerebral laterality in homosexual males: Preliminary communication using magnetoencephalography. Arch.Sex.Behav.24: 585–593.
Rogers, S. M., and Turner, C. F. (1991). Male-male sexual contact in the USA: Findings from five sample surveys, 1970–1990. J.Sex Res.28(4): 491–519.
Rowe, D. C. (1994). The Limits of Family Influence: Genes, Experience, and Behavior, Guilford, New York.
Saghir, M. T., and Robins, E. (1973). Male and Female Homosexuality, Williams and Wilkins, Baltimore.
Salais, D., and Foscher, R. B. (1995). Sexual preference and altruism. J.Homosex.28: 185–196.
Schlegel, W. S. (19xx). Die Sexualinstinkte de Menschen, Tutten Verlag, Munich.
Siever, M. D. (1994). Sexual orientation and gender as factors in socioculturally acquired vulnerability to body dissatisfaction and eating disorders. J.Consult.Clin.Psychol.62: 252–260.
Spence, J. T., and Helmreich, R. L. (1978). Masculinity and Feminity, University of Texas Press, Austin.
Sprecher, S. (1989). The importance to males and females of physical attractiveness, earnings potential, and expressiveness in initial attraction. Sex Roles21: 591–605.
Sprecher, S., Sullivan, Q., and Hartfield, E. (1994). Mate selection preferences: Gender differences examined in a national sample. J.Pers.Soc.Psychol.66: 1074–1080.
Sulloway, F. J. (1996). Born to Rebel: Birth Order, Family Dynamics, and Creative Lives, Pantheon Books, New York.
Sundet, J. M., Kvalem, I. L., Magnus, P., and Bakketeig, L. S. (1988). Prevalence of risk-prone behavior in the central population of Norway. In Fleming, A. F., Carballo, M., and Fitzsimons, D. F. (eds.), The Global Impact of AIDS, Alan R. Liss, London.
Swaab, D. F., and Hofman, M. A. (1990). An enlarged suprachiasmatic nucleus in homosexual men. Brain Res.537: 141–148.
Swaab, D. F., and Hofman, M. A. (1995). Sexual differentiation in the human hypothalamus in relation to gender and sexual orientation. Trends Neurosci.18: 264–270.
Swaab, D. F., Slob, A. K., Houtsmuller, E. J., Brand, T., and Zhou, J. N. (1995). Increased number of vasopressin neurons in the suprachiasmatic nucleus (SCN) of “bisexual” adult male rats following perinatal treatment with the aromatase blocker ATD. Dev.Brain Res.85: 273–279.
Swaab, D. F., Zhou, J. N., Fodor, M., and Jofman, M. A. (1997). Sexual differentiation of the human hypothalamus: Differences according to sex, sexual orientation, and transsexuality. In Ellis, L., and Ebertz, L. (eds.), Sexual Orientation: Toward Biological Understanding, Praeger, Westport, CT, pp. 129–150.
Symons, D. (1990). The Evolution of Human Sexuality, Oxford University Press, New York.
Tuttle, G. E., and Pillard, R. C. (1991). Sexual orientation and cognitive abilities. Arch.Sex.Behav.13: 427–439.
Van de Ven, P., Rodden, P., Crawford, J., and Kippax, S. (1997). A comparative demographic and sexual profile of older homosexually active men. J.Sex Res.34: 349–360.
Wegesin, D. J. (1998). Event-related potentials in homosexual and heterosexual men and women: Sex-dimorphic patterns in verbal asymmetries and mental rotation. Brain Cogn.36: 73–92.
Weinrich, J. D. (1976). Human Reproductive Strategies(Doctoral dissertation, Harvard University), University Microfilms No. 77–8348.
Weinrich, J. D. (1987). Sexual Landscapes, Scribner's Sons, New York.
Wellings, K., Field, J., Johnson, A., and Wadsworth, J. (1994). Sexual Behavior in Britain., Penguin Books, New York.
Werner, D. (1998). On the evolution and cross-cultural variation in male homosexuality [Sobre a evolu¸cïo e varia¸cïo cultural na homossexualidade masculina]. In Pedro, J. M., and Grossi, M. P., (orgs.), Masculino, Feminino Plural, Mulheres, Florian´opolis, pp.99–129.
Whitam, F. L., Diamond, M., and Martin, J. (1993). Homosexual orientation in twins: A report on 61 pairs and 3 triplet sets. Arch.Sex.Behav.22: 187–206.
Wilson, E. O. (1975). Sociobiology: The New Synthesis, Harvard University Press, Cambridge, MA.
Zucker, K. J., and Bradley, S. (1995). Gender Identity Disorder and Psychosexual Problems in Children and Adults, Guilford Press, New York.
Zucker, K. J., Green, R., Coates, S., Zuger, B., Cohen-Kettenis, P. T., Zecca, G. M., Lertora, V., Money, J., Hahn-Burke, S., Bradley, S. J., and Blanchard, R. (1997). Sibling sex ratio of boys with gender identity disorder. J.Child Psychol.Psychiatry38: 543–551.
- Homosexuality, Birth Order, and Evolution: Toward an Equilibrium Reproductive Economics of Homosexuality
Archives of Sexual Behavior
Volume 29, Issue 1 , pp 1-34
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- Edward M. Miller (1)
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- 1. Department of Economics and Finance, University of New Orleans, New Orleans, Louisiana, 70148