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For example, studies on the effect of embryonic endocrine problems on homosexuality have found a very restricted effect size. Further, the reviews on homosexuality have only involved a small proportion of topics. Homosexuality has long been regarded a mental disease. In 1886, psychologists Richard von Krafft-Ebing listed sexual perversions as "sex-associated psychological disorders. " Sigmund Freud described homosexuality as "a conflicted psychosexual advancement. " Other studies imply that the cause of homosexuality is not a single factor but a combination of inborn factors and environmental impacts. There are a few elements associated with the genetic basis of sexual orientation, including the presence of older brothers. Having older brothers in the family significantly increases the chance of homosexuality. Each older brother has a 33% boom in the incidence of homosexuality. Additionally, older brothers are associated with a statistically large reduction in weight at birth. These findings cannot be explained by ameliorations in family heritage or schooling.
21.01.2023
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