2024
DOI: 10.1007/s10508-024-02892-8
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Examining the Fraternal Birth Order Effect and Sexual Orientation: Insights from an East European Population

Jakub Fořt,
Benjamin Kunc,
Jaroslava Varella Valentova
et al.

Abstract: 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 (AER… Show more

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