May 13, 2025
Science

The chance of being homosexual for people with older brothers increases during birth: but how?

  • March 2, 2024
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homosexuality only biological or only social It would be wrong to look at it as such. There can be many triggers, and one of these triggers can be

homosexuality only biological or only social It would be wrong to look at it as such. There can be many triggers, and one of these triggers can be biological factors. Even having a “big brother,” which we’ll talk about in a moment!

The percentages that emerge in this situation, which we can only explain with biological science, are truly astonishing. When you’re ready The relationship between homosexuality and having an older brother and let’s look at the percentages.

The chance of homosexuality increases depending on birth order.

Research into the increase in the risk of homosexuality in men, depending on birth order; men with older brothers are more likely to be homosexual shows that it is higher.

10 scientific studies with more than 5,000 subjects of your data Researchers who conducted a cross-sectional analysis showed that men with older brothers were 38% more likely to identify as homosexual!

As the number of older brothers increases, the chance that the brother or sister is homosexual also increases.

The “sibling birth order effect” is a definition that reveals the biological origins of sexual orientation, and this long-standing hypothesis suggests that homosexual orientations increase as the number of biological siblings one has increases. The effect is from the mother in response to proteins produced by the male fetus It is attributed to the immune response.

The proteins enter the mother’s bloodstream.

Proteins that enter the mother’s bloodstream are passed on to subsequent children production of antibodies that affect sexual development It triggers. These maternal antibodies accumulate during overlapping pregnancies with male fetuses.

We can also say: Children are more exposed to ‘male-specific substances’ during birth. So those who have more older brothers possibility of attraction to the same sex rising.

What are the situations like for women?

Almost the same results were found in a study of women with older brothers. If they have older brothers the same The chance of being attracted to someone of the biological sex increased. This finding again supported that maternal antibodies and fetal proteins also interact to stimulate female sexual development.

To summarize; Gender and the number of siblings play a role in the development of sexual orientation. This evidence refutes the claim that sexual orientation is “a trend,” as some claim. But that doesn’t matter, because the respect we should have for people in society, Sexual identity should not depend on whether it is innate or a choice.

Sources: University of Melbourne, Royal Society Publishing, PNAS

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