title: Homosexuality and older brothers.
authors.forename: J T
authors.initials: JT
authors.lastname: Martin
authors.forename: G
authors.initials: G
authors.lastname: Gugelchuk
mesh_terms: D000328:Adult; D001722:Birth Order; D005190:Family; D005260:Female; D005313:Fetal Death; D006716:Homosexuality / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008423:Maternal Age; D012044:Regression Analysis; D012107:Research Design; D012737:Sex Factors; D019529:Sexuality