title: Male homosexuals have a greater birth order than chance expectation.
authors.forename: W H
authors.initials: WH
authors.lastname: James
mesh_terms: D000328:Adult; D001722:Birth Order; D002648:Child; D004777:Environment; D005260:Female; D018451:Homosexuality, Male / Q000235:genetics*; D006801:Humans; D008297:Male; D012307:Risk Factors; D012801:Sibling Relations