Men raised with several older step- or adopted brothers do not have an increased chance of being gay.
"So what that means is that the environment a person is raised in really makes not much difference,'' he said.
What makes a difference, he said, is having older brothers who shared the same womb and gestational experience, suggesting the difference is because of "some sort of prenatal factor.''
One possibility, he suggests, is a maternal immune response to succeeding male fetuses. The mother may react to a male fetus as foreign but not to a female fetus because the mother is also female.
It might be like the maternal immune response that can occur when a mother has Rh-negative blood but her fetus has Rh-positive blood. Without treatment, the mother can develop antibodies that may attack the fetus during future pregnancies.
Whether that's what is happening remains to be seen, but it is a provocative hypothesis, said a commentary by Breedlove, David A. Puts and Cynthia L. Jordan, all of Michigan State , according to livescience.com
The Independent says in its article on the same topic that Marc Breedlove, of Michigan State University , a colleague of Dr Bogaert, wrote in the Proceedings of the National Academy of Sciences: "[Sigmund] Freud thought 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?"
Source: agencies
Prepared by Alexander Timoshik
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