Research confirms men with older brothers more likely to be gay
27.01.2022 - 19:27
/ mambaonline.com
New research shows having a greater number of older brothers increases the probability of a person entering a same-sex union at some point in their lives.
This finding, detailed in our paper published in the Journal of Sex Research, offers a rare insight into the origins of sexual orientation.
The origins of sexual orientation
In recent decades, many countries have achieved remarkable progress towards equal treatment of LGBTIQ+ people, including greater public support and more protective legislation. But despite these encouraging developments, sexual minorities still experience high levels of stigma – and the origins of sexual orientation remain a matter of debate.
A growing body of research is attempting to shed light on why some people experience same-sex sexual attraction and others don’t. These studies have substantial implications for public opinion and debate, and subsequently the treatment of LGBTIQ+ people.
For example, we know people who view sexual orientation as a product of biological factors (such as hormones or genetics) are more likely to support sexual minorities and their civil rights, compared to those who view it as a product of social factors or individual choice.
The fraternal birth order effect
The “fraternal birth order effect” is one of the most well-documented patterns supporting a biological origin of human sexual orientation. This longstanding hypothesis proposes men’s propensity for homosexuality increases with the number of older biological brothers they have.
This effect has been attributed to a mother’s immune reaction to proteins produced by a male foetus. The proteins enter the mother’s bloodstream and trigger the production of antibodies that influence the sexual development of
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