Reuters: A study has uncovered that the more older brothers a man has the more likely he is to be gay -- but they have to be biological brothers from the same mother, not just older males that the man grows up with. It's important to note that this is a correlation, and the suggested mechanism is just a theory. To whit:
"These results support a prenatal origin to sexual orientation development in men and indicate that the fraternal birth-order effect is probably the result of a maternal 'memory' for male gestations or births," Bogaert writes in his report in PNAS Early Edition...A woman's body may see a male fetus as "foreign," Bogaert explains, and her immune response to subsequent male fetuses may grow progressively stronger."
If this were true it could also explain why there are more homosexual men than women -- because the immune response is stronger.
There are two ways this could be interpreted. First, that people are born homosexual the same way they are born white or black, so it's perfectly normal. Second, people who argue that homosexuality is a disease will use it to back up their argument, although really the homosexuality is the symptom of a person being considered a disease...
For mine, I haven't seen the report so I don't know how strong this correlation is, it could be nothing. Even if it isn't it's probably over-simplistic. Still, it's interesting conversation fodder when you're bored and want to start an argument...
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