The role of miscarriage and sororal birth order in male same-sex orientation: Theoretical predictions and empirical data
Michel Raymond A, Ana Aguerre, Valérie Durand, Menelaos Apostolou, Julien Barthes, Sarah Nila, Bambang Suryobroto, Mostafa Sadr-Bazzaz, Paul L. Vasey, Daniel Turek, Pierre‐André Crochet
This study investigates the biological mechanisms behind male same-sex orientation, finding that miscarriage rates may explain some birth order effects, though discrepancies suggest additional factors.
bioRxiv · Sep 28, 2026 · PreprintEvolutionary Biology