Increased birth rank of homosexual males: disentangling the older brother effect and sexual antagonism hypothesis by Raymond, Michel, Turek, Daniel, Durand, Valérie, Nila, Sarah, Suryobroto, Bambang, Vadez, Julien, Barthes, Julien, Apostolou, Menelaos, Crochet, Pierre-André

“…However, there is no consensus on whether both FBOE and AE are present in human populations, or if only one of these mechanisms is at play with its effect mimicking the signature of the other mechanism. An additional sororal birth order effect (SBOE) has also recently been proposed. …”
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