References
- American Psychological Association. (2020). Publication manual of the American Psychological Association: The official guide to APA style (7th ed.). Author.
- Apostolou, M. (2020). Does fraternal birth order predict male homosexuality, bisexuality, and heterosexual orientation with same-sex attraction? Evidence from a Greek-speaking sample from Greece. Archives of Sexual Behavior, 49(2), 575–579. https://doi.org/https://doi.org/10.1007/s10508-019-01466-3
- Bailey, J. M., Vasey, P. L., Diamond, L. M., Breedlove, S. M., Vilain, E., & Epprecht, M. (2016). Sexual orientation, controversy, and science. Psychological science in the public interest, 17(2), 45–101. https://doi.org/https://doi.org/10.1177/1529100616637616
- Bearman, P., & Bruckner, H. (2002). Opposite‐sex twins and adolescent same‐sex attraction. American Journal of Sociology, 107(5), 1179–1205. https://doi.org/https://doi.org/10.1086/341906
- Blanchard, R. (1997). Birth order and sibling sex ratio in homosexual versus heterosexual males and females. Annual Review of Sex Research, 8(1), 27–67. https://doi.org/https://doi.org/10.1080/10532528.1997.10559918
- Blanchard, R. (2007). Older-sibling and younger-sibling sex ratios in Frisch and Hviid’s (2006) national cohort study of two million Danes. Archives of Sexual Behavior, 36(6), 860–863. https://doi.org/https://doi.org/10.1007/s10508-006-9154-z
- Blanchard, R. (2012). Fertility in the mothers of firstborn homosexual and heterosexual men. Archives of Sexual Behavior, 41(3), 551–556. https://doi.org/https://doi.org/10.1007/s10508-011-9888-0
- Blanchard, R. (2018a). Fraternal birth order, family size, and male homosexuality: meta-analysis of studies spanning 25 years. Archives of Sexual Behavior, 47(1), 1–15. https://doi.org/https://doi.org/10.1007/s10508-017-1007-4
- Blanchard, R. (2018b). Response to commentaries: Meta-analysis of probability samples and other new evidence. Archives of Sexual Behavior, 47(1), 49–57. https://doi.org/https://doi.org/10.1007/s10508-017-1134-y
- Blanchard, R., Barbaree, H., Bogaert, A. F., Dickey, R., Klassen, P., Kuban, M., & Zucker, K. J. (2000). Fraternal birth order and sexual orientation in pedophiles. Archives of Sexual Behavior, 29(5), 463–478. https://doi.org/https://doi.org/10.1023/a:1001943719964
- Blanchard, R., Beier, K. M., Gomez Jimenez, F. R., Grundmann, D., Krupp, J., Semenyna, S. W., & Vasey, P. L. (2021). Meta-analyses of fraternal and sororal birth order effects in homosexual pedophiles, hebephiles, and teleiophiles. Archives of Sexual Behavior, 50(3), 779–796. https://doi.org/https://doi.org/10.1007/s10508-020-01819-3
- Blanchard, R., & Bogaert, A. F. (1996). Homosexuality in men and number of older brothers. American Journal of Psychiatry, 153(1), 27–31. https://doi.org/https://doi.org/10.1176/ajp.153.1.27
- Blanchard, R., & Bogaert, A. F. (1998). Birth order in homosexual versus heterosexual sex offenders against children, pubescents, and adults. Archives of Sexual Behavior, 27(6), 595–603. https://doi.org/https://doi.org/10.1023/A:1018773117741
- Blanchard, R., Cantor, J. M., Bogaert, A. F., Breedlove, S. M., & Ellis, L. (2006). Interaction of fraternal birth order and handedness in the development of male homosexuality. Hormones and Behavior, 49(3), 405–414. https://doi.org/https://doi.org/10.1016/j.yhbeh.2005.09.002
- Blanchard, R., Krupp, J., VanderLaan, D. P., Vasey, P. L., & Zucker, K. J. (2020). A method yielding comparable estimates of the fraternal birth order and female fecundity effects in male homosexuality. Proceedings of the Royal Society B: Biological Sciences, 287(1923), 20192907. https://doi.org/https://doi.org/10.1098/rspb.2019.2907
- Blanchard, R., & Lippa, R. A. (2021). Reassessing the effect of older sisters on sexual orientation in men. Archives of Sexual Behavior, 50(3), 797–805. https://doi.org/https://doi.org/10.1007/s10508-020-01840-6
- Blanchard, R., & Sheridan, P. (1992). Sibling size, sibling sex ratio, birth order, and parental age in homosexual and nonhomosexual gender dysphorics. Journal of Nervous and Mental Disease, 180(1), 40–47. https://doi.org/https://doi.org/10.1097/00005053-199201000-00009
- Blanchard, R., & VanderLaan, D. P. (2015). Commentary on Kishida and Rahman (2015), including a meta-analysis of relevant studies on fraternal birth order and sexual orientation in men. Archives of Sexual Behavior, 44(5), 1503–1509. https://doi.org/https://doi.org/10.1007/s10508-015-0555-8
- Blanchard, R., Zucker, K. J., Cohen-Kettenis, P. T., Gooren, L., & Bailey, J. (1996). Birth order and sibling sex ratio in two samples of Dutch gender-dysphoric homosexual males. Archives of Sexual Behavior, 25(5), 495–514. https://doi.org/https://doi.org/10.1007/BF02437544
- Bogaert, A. F. (1997). Birth order and sexual orientation in women. Behavioral Neuroscience, 111(6), 1395–1397. https://doi.org/https://doi.org/10.1037/0735-7044.111.6.1395
- Bogaert, A. F. (2000). Birth order and sexual orientation in a national probability sample. Journal of Sex Research, 37(4), 361–368. https://doi.org/https://doi.org/10.1080/00224490009552059
- Bogaert, A. F. (2006). Biological versus nonbiological older brothers and men’s sexual orientation. Proceedings of the National Academy of Sciences of the United States of America, 103(28), 10771–10774. https://doi.org/https://doi.org/10.1073/pnas.0511152103
- Bogaert, A. F., Bezeau, S., Kuban, M., & Blanchard, R. (1997). Pedophilia, sexual orientation, and birth order. Journal of Abnormal Psychology, 106(2), 331–335. https://doi.org/https://doi.org/10.1037//0021-843x.106.2.331
- Bogaert, A. F., Skorska, M. N., Wang, C., Gabrie, J., MacNeil, A. J., Hoffarth, M. R., VanderLaan, D. P., Zucker, K. J., & Blanchard, R. (2018). Male homosexuality and maternal immune responsivity to the Y-linked protein NLGN4Y. Proceedings of the National Academy of Sciences of the United States of America, 115(2), 302–306. https://doi.org/https://doi.org/10.1073/pnas.1705895114
- Bozkurt, A., Bozkurt, O. H., & Sonmez, I. (2015). Birth order and sibling sex ratio in a population with high fertility: Are Turkish male to female transsexuals different? Archives of Sexual Behavior, 44(5), 1331–1337. https://doi.org/https://doi.org/10.1007/s10508-014-0425-9
- Camperio Ciani, A., Battaglia, U., Cesare, L., Camperio Ciani, G., & Capiluppi, C. (2018). Possible balancing selection in human female homosexuality. Human Nature, 29(1), 14–32. https://doi.org/https://doi.org/10.1007/s12110-017-9309-8
- Camperio Ciani, A., Pellizzari, E., & Novelli, G. (2012). Fecundity of paternal and maternal non-parental female relatives of homosexual and heterosexual men. PloS One, 7(12), e51088. https://doi.org/https://doi.org/10.1371/journal.pone.0051088
- Camperio-Ciani, A., Corna, F., & Capiluppi, C. (2004). Evidence for maternally inherited factors favouring male homosexuality and promoting female fecundity. Proceedings of the Royal Society B: Biological Sciences, 271(1554), 2217–2221. https://doi.org/https://doi.org/10.1098/rspb.2004.2872
- Chahnazarian, A. (1988). Determinants of the sex ratio at birth: Review of recent literature. Social Biology, 35(3–4), 214–235. https://doi.org/https://doi.org/10.1080/19485565.1988.9988703
- Currin, J. M., Gibson, L., & Hubach, R. D. (2015). Multidimensional assessment of sexual orientation and the fraternal birth order effect. Psychology of Sexual Orientation and Gender Diversity, 2(2), 113–122. https://doi.org/https://doi.org/10.1037/sgd0000103
- Desbiens, N. A. (2007). The reporting of statistics in medical educational studies: An observational study. BMC Medical Research Methodology, 7(1), 35. https://doi.org/https://doi.org/10.1186/1471-2288-7-35
- Francis, A. M. (2008). Family and sexual orientation: The family-demographic correlates of homosexuality in men and women. Journal of Sex Research, 45(4), 371–377. https://doi.org/https://doi.org/10.1080/00224490802398357
- Frisch, M., & Hviid, A. (2006). Childhood family correlates of heterosexual and homosexual marriages: A national cohort study of two million Danes. Archives of Sexual Behavior, 35(5), 533–547. https://doi.org/https://doi.org/10.1007/s10508-006-9062-2
- Gates, G. J. (2015). Marriage and Family: LGBT individuals and same-sex couples. The Future of Children, 25(2), 67–87. https://doi.org/https://doi.org/10.1353/foc.2015.0013
- Gelman, A. (2005). Analysis of variance—Why it is more important than ever. The Annals of Statistics, 33(1), 1–53. https://doi.org/https://doi.org/10.1214/009053604000001048
- Gómez Jiménez, F. R., Semenyna, S. W., & Vasey, P. L. (2020a). The relationship between fraternal birth order and childhood sex‐atypical behavior among the Istmo Zapotec muxes. Developmental Psychobiology, 62(6), 792–803. https://doi.org/https://doi.org/10.1002/dev.21987
- Gómez Jiménez, F. R., Semenyna, S. W., & Vasey, P. L. (2020b). Offspring production among the relatives of Istmo Zapotec men and muxes. Archives of Sexual Behavior, 49(2), 581–594. https://doi.org/https://doi.org/10.1007/s10508-019-01611-y
- Gomez-Gil, E., Esteva, I., Carrasco, R., Almaraz, M. C., Pasaro, E., Salamero, M., & Guillamon, A. (2011). Birth order and ratio of brothers to sisters in Spanish transsexuals. Archives of Sexual Behavior, 40(3), 505–510. https://doi.org/https://doi.org/10.1007/s10508-010-9614-3
- Government of the Netherlands. (2018). LGBTI equality in the Netherlands: Orange is always part of the rainbow. https://www.government.nl/documents/leaflets/2018/06/01/lgbti-equality-in-the-netherlands
- Graubard, B., & Korn, E. (2002). Inference for superpopulation parameters using sample surveys. Statistical Science, 17(1), 73–96. https://doi.org/https://doi.org/10.1214/ss/1023798999
- Hare, E. H., & Moran, P. A. P. (1979). Parental age and birth order in homosexual patients: A replication of Slater’s study. British Journal of Psychiatry, 134(2), 178–182. https://doi.org/https://doi.org/10.1192/bjp.134.2.178
- Iemmola, F., & Camperio Ciani, A. (2009). New evidence of genetic factors influencing sexual orientation in men: Female fecundity increase in the maternal line. Archives of Sexual Behavior, 38(3), 393–399. https://doi.org/https://doi.org/10.1007/s10508-008-9381-6
- Kabátek, J., & Perales, F. (2021). Academic achievement of children in same- and different-sex-parented families: A population-level analysis of linked administrative data from the Netherlands. Demography, 58(2), 393–418. https://doi.org/https://doi.org/10.1215/00703370-8994569
- Khorashad, B. S., Zucker, K. J., Talaei, A., Rajabzadeh, F., Hamed, Z., Akbarian, P., & Blanchard, R. (2020). Birth order and sibling sex ratio in androphilic males and gynephilic females diagnosed with gender dysphoria from Iran. Journal of Sexual Medicine, 17(6), 1195–1202. https://doi.org/https://doi.org/10.1016/j.jsxm.2020.02.004
- Khovanova, T. (2020). On the mathematics of the fraternal birth order effect and the genetics of homosexuality. Archives of Sexual Behavior, 49(2), 551–555. https://doi.org/https://doi.org/10.1007/s10508-019-01573-1
- King, M., Green, J., Osborn, D. P., Arkell, J., Hetherton, J., & Pereira, E. (2005). Family size in white gay and heterosexual men. Archives of Sexual Behavior, 34(1), 117–122. https://doi.org/https://doi.org/10.1007/s10508-005-1006-8
- Kinnish, K. K., Strassberg, D. S., & Turner, C. W. (2005). Sex differences in the flexibility of sexual orientation: A multidimensional retrospective assessment. Archives of Sexual Behavior, 34(2), 173–183. https://doi.org/https://doi.org/10.1007/s10508-005-1795-9
- Kishida, M., & Rahman, Q. (2015). Fraternal birth order and extreme right-handedness as predictors of sexual orientation and gender nonconformity in men. Archives of Sexual Behavior, 44(5), 1493–1501. https://doi.org/https://doi.org/10.1007/s10508-014-0474-0
- Kuyper, L., & Vanwesenbeeck, I. (2009). High levels of same-sex experiences in the Netherlands: Prevalences of same-sex experiences in historical and international perspective. Journal of Homosexuality, 56(8), 993–1010. https://doi.org/https://doi.org/10.1080/00918360903275401
- LeVay, S. (2016). Gay, straight, and the reason why. Oxford University Press.
- Li, G., & Wong, W. I. (2018). Single-sex schooling: Friendships, dating, and sexual orientation. Archives of Sexual Behavior, 47(4), 1025–1039. https://doi.org/https://doi.org/10.1007/s10508-018-1187-6
- Mendos, L. (2019). State-sponsored homophobia. 13th ed. International Lesbian, Gay, Bisexual, Trans and Intersex Association. https://ilga.org/state-sponsored-homophobia-report-2019
- Mishel, E., England, P., Ford, J., & Caudillo, M. L. (2020). Cohort increases in sex with same-sex partners: Do trends vary by gender, race, and class? Gender & Society, 34(2), 178–209. https://doi.org/https://doi.org/10.1177/0891243219897062
- Nielsen, H. (2011). Secondary recurrent miscarriage and H-Y immunity. Human Reproduction Update, 17(4), 558–574. https://doi.org/https://doi.org/10.1093/humupd/dmr005
- Nielsen, H., Mortensen, L., Nygaard, U., Schnor, O., Christiansen, O., & Andersen, A. M. N. (2008). Brothers and reduction of the birth weight of later-born siblings. American Journal of Epidemiology, 167(4), 480–484. https://doi.org/https://doi.org/10.1093/aje/kwm330
- Nila, S., Crochet, P.-A., Barthes, J., Rianti, P., Juliandi, S. B., Suryobroto, B., & Raymond, M. (2019). Male homosexual preference: Femininity and the older brother effect in Indonesia. Evolutionary Psychology, 17(4), 1–8. https://doi.org/https://doi.org/10.1177/1474704919880701
- OECD. (2019). Society at a glance 2019: OECD social indicators. https://doi.org/https://doi.org/10.1787/soc_glance-2019-en
- Pachankis, J. E., & Bränström, R. (2019). How many sexual minorities are hidden? Projecting the size of the global closet with implications for policy and public health. PloS One, 14(6), e0218084. https://doi.org/https://doi.org/10.1371/journal.pone.0218084
- Pew Research Center. (2019). Bisexual adults are far less likely than gay men and lesbians to be ‘out’ to the people in their lives. https://pewrsr.ch/2wZ2RAd
- Rahman, Q., Clarke, K., & Morera, T. (2009). Hair whorl direction and sexual orientation in human males. Behavioral Neuroscience, 123(2), 252–256. https://doi.org/https://doi.org/10.1037/a0014816
- Rahman, Q., Collins, A., Morrison, M., Orrells, J. C., Cadinouche, K., Greenfield, S., & Begum, S. (2008). Maternal inheritance and familial fecundity factors in male homosexuality. Archives of Sexual Behavior, 37(6), 962–969. https://doi.org/https://doi.org/10.1007/s10508-007-9191-2
- Saxby, K., De New, S. C., & Petrie, D. (2020). Structural stigma and sexual orientation disparities in healthcare use: Evidence from Australian census-linked-administrative data. Social Science & Medicine, 255, 113027. https://doi.org/https://doi.org/10.1016/j.socscimed.2020.113027
- Schagen, S. E., Delemarre-van de Waal, H. A., Blanchard, R., & Cohen-Kettenis, P. T. (2012). Sibling sex ratio and birth order in early-onset gender dysphoric adolescents. Archives of Sexual Behavior, 41(3), 541–549. https://doi.org/https://doi.org/10.1007/s10508-011-9777-6
- Semenyna, S. W., Petterson, L. J., VanderLaan, D. P., & Vasey, P. L. (2017). A comparison of the reproductive output among the relatives of Samoan androphilic fa’afafine and gynephilic men. Archives of Sexual Behavior, 46(1), 87–93. https://doi.org/https://doi.org/10.1007/s10508-016-0765-8
- Sheldon, J., Pfeffer, C., Jayaratne, T., Feldbaum, M., & Petty, E. (2007). Beliefs about the etiology of homosexuality and about the ramifications of discovering its possible genetic origin. Journal of Homosexuality, 52(3–4), 111–150. https://doi.org/https://doi.org/10.1300/J082v52n03_06
- Slater, E. (1962). Birth order and maternal age of homosexuals. The Lancet, 279(7220), 69–71. https://doi.org/https://doi.org/10.1016/s0140-6736(62)91719-1
- Valfort, M. A. (2017). LGBTI in OECD countries. OECD Publishing. https://doi.org/https://doi.org/10.1787/D5D49711-EN
- VanderLaan, D. P., Forrester, D. L., Petterson, L. J., Vasey, P. L., & Vitzthum, V. J. (2012). Offspring production among the extended relatives of Samoan men and Fa’afafine. PloS One, 7(4), e36088–e36088. https://doi.org/https://doi.org/10.1371/journal.pone.0036088
- VanderLaan, D. P., & Vasey, P. L. (2011). Male sexual orientation in independent Samoa: Evidence for fraternal birth order and maternal fecundity effects. Archives of Sexual Behavior, 40(3), 495–503. https://doi.org/https://doi.org/10.1007/s10508-009-9576-5
- VanderLaan, D. P., Blanchard, R., Zucker, K. J., Massuda, R., Fontanari, A. M. V., Borba, A. O., Costa, A. B., Schneider, M. A., Mueller, A., Soll, B. M. B., Schwarz, K., Da Silva, D. C., & Lobato, M. I. R. (2017). Birth order and androphilic male-to-female transsexualism in Brazil. Journal of Biosocial Science, 49(4), 527–535. https://doi.org/https://doi.org/10.1017/S0021932016000584
- Vasey, P. L., & VanderLaan, D. P. (2007). Birth order and male androphilia in Samoan fa’afafine. Proceedings of the Royal Society B: Biological Sciences, 274(1616), 1437–1442. https://doi.org/https://doi.org/10.1098/rspb.2007.0120
- Xu, Y., Norton, S., & Rahman, Q. (2019). Early life conditions and adolescent sexual orientation: A prospective birth cohort study. Developmental Psychology, 55(6), 1226–1243. https://doi.org/https://doi.org/10.1037/dev0000704
- Zietsch, B. P. (2018). Reasons for caution about the fraternal birth order effect. Archives of Sexual Behavior, 47(1), 47–48. https://doi.org/https://doi.org/10.1007/s10508-017-1086-2