How Are The Gay Younger Brothers Doing?

Careful lit-review reconciling the fraternal-birth-order-effect (FBOE) literature: the ~2M-Dane near-null (Frisch/Hviid), Vilsmeier et al's dense statistical critique (the 'difference between significant and non-significant is not itself significant' point; family-size vs. birth-order confounding), and the decisive ~9M-Dutch study (Ablaza et al) showing older siblings in general (older brothers slightly more) raise same-sex-union probability for both sexes. Weighs the maternal-immune / H-Y-antigen / NLGN4Y mechanism (now awkward for the both-sexes finding) and ends with calibrated predictions.

Quality 67 · Strong. Strong — a good, numerate synthesis with honest weighing of the biggest/best studies and calibration; genuinely useful but mostly reporting others' work with his own reconciliation, not field-defining. 67.

Claude’s paradigm shift 48 · Moderate. Notable — synthesizes and adjudicates existing studies; modest own novelty.

Real-world impact 2 · Minor. Within-discourse. 2.