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There are a couple of factors linked to the genetic basis of sexual orientation, adding the presence of older brothers. Having older brothers in the family significantly increases the probability of homosexuality. Each older brother has a 33% increase in the occurrence of homosexuality. Additionally, older brothers are associated with a statistically gigantic discount in weight at birth. These findings cannot be explained by variations in family heritage or education. Researchers speculate that the effect of older brothers is because of a mother's accumulation of antibodies to proteins expressed in the male brain. However, these antigenic proteins have not been identified. In Japan, six-in-ten respondents say that homosexuality may be authorised. However, only 39% of men share this view. In South Korea, about half of women and 31% of men express constructive feelings toward homosexuality. In the US, more conservative people feel that homosexuality is wrong.
20.01.2023
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