title: Birth order and sexual orientation in men: evidence for two independent interactions.
abstract: Birth order is correlated with male sexual orientation, but the reason(s) for this relationship is unclear. In the present study, data from a Canadian sample of homosexual and heterosexual men (N=604) were used to present evidence of two independent birth order interactions--one with height and the other with parental age--predicting sexual orientation in men. If these findings prove reliable, it raises the possibility that different aetiological factors underlie the birth order/sexual orientation relationship in men.
authors.affiliation: Department of Community Health Sciences, Brock University, St Catharines, Canada.
authors.forename: Anthony F
authors.initials: AF
authors.lastname: Bogaert
authors.forename: Jian
authors.initials: J
authors.lastname: Liu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001722:Birth Order; D001827:Body Height; D005783:Gender Identity; D020010:Heterosexuality / Q000706:statistics & numerical data*; D018451:Homosexuality, Male / Q000706:statistics & numerical data*; D006801:Humans; D016015:Logistic Models; D008297:Male; D016555:Matched-Pair Analysis; D008423:Maternal Age; D008875:Middle Aged; D009864:Ontario