An academic has enraged homosexuals with his claim that recipients of the sperm of gay donors should be told that a "gay gene" could be passed on to the child. The suggestion has been dismissed as pathetic by a gay rights organisation. Genetics experts, however, generally agree there is evidence of a genetic component to sexual orientation – but argue the link is complex and ill-defined. After a complaint to the Human Rights Commission, New Zealand's biggest fertility service, Fertility Associates, has decided to accept sperm from gay men – previously barred because of a supposed higher HIV risk. Responding...