Examining the Fraternal Birth Order Effect and Sexual Orientation: Insights from an East European Population
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00023752%3A_____%2F24%3A43921355" target="_blank" >RIV/00023752:_____/24:43921355 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11210/24:10484354 RIV/00216208:11240/24:10484354 RIV/00216208:11310/24:10484354
Result on the web
<a href="https://link.springer.com/article/10.1007/s10508-024-02892-8" target="_blank" >https://link.springer.com/article/10.1007/s10508-024-02892-8</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1007/s10508-024-02892-8" target="_blank" >10.1007/s10508-024-02892-8</a>
Alternative languages
Result language
angličtina
Original language name
Examining the Fraternal Birth Order Effect and Sexual Orientation: Insights from an East European Population
Original language description
The development of human sexual orientation remains a complex and multifaceted subject. It is often studied but its origins continue to elude us. In this preregistered study, our primary objective was to demonstrate the fraternal birth order effect (FBOE), which assumes a higher prevalence of older brothers in gay men than in their straight counterparts and which has also been recently recorded in lesbian women. Our second aim was to explore any potential impact of the FBOE on anal-erotic role orientation (AERO), both in gay and straight men. Our study sample included 693 gay men, 843 straight men, 265 lesbian women, and 331 straight women from Czechia and Slovakia. Employing a conventionally parameterized logistic regression model, we substantiated the FBOE among both gay men (OR = 1.35 for maternal older brothers) and lesbian women (OR = 1.71). These outcomes were confirmed by a more nuanced parameterization recently proposed by Blanchard (2022). Nonmaternal older brothers did not exhibit a significant influence on their younger brothers’ sexual orientation. Contrary to some earlier reports, however, our data did not establish the FBOE as exclusive to gay men with the receptive AERO. Furthermore, our observations indicated a lower offspring count for mothers of gay men compared to mothers of straight men. Emphasizing the positive FBOE outcomes, we acknowledge the need for caution regarding the various options that can be used to estimate the familial influences on sexual orientation.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
50101 - Psychology (including human - machine relations)
Result continuities
Project
—
Continuities
V - Vyzkumna aktivita podporovana z jinych verejnych zdroju
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Archives of Sexual Behavior
ISSN
0004-0002
e-ISSN
1573-2800
Volume of the periodical
53
Issue of the periodical within the volume
8
Country of publishing house
US - UNITED STATES
Number of pages
18
Pages from-to
2905-2922
UT code for WoS article
001246502400001
EID of the result in the Scopus database
2-s2.0-85195829104