O brother, where art thou? The fraternal birth-order effect on male sexual orientation.
-- Puts et al., PNAS 2006 103 (28) 10531-10532.
Freud thought that a distant, emotionally cold father might prevent a boy from identifying with Dad and steer him to homosexuality. How much stranger it will be if, instead of the father’s psychological rejection, it is the mother’s immunological rejection that inadvertently but actively makes her son gay?