However, there are lots of barriers in our contemporary knowing of the prenatal points that affect sexual differentiation. For instance, studies on the effect of embryonic endocrine disorders on homosexuality have found a very limited effect size. Further, the research on homosexuality have only concerned a small proportion of topics. Homosexuality has long been considered a mental ailment. In 1886, psychologists Richard von Krafft-Ebing listed sexual perversions as "sex-associated psychological problems. " Sigmund Freud described homosexuality as "a conflicted psychosexual growth. " Other research suggest that the reason behind homosexuality is not a single factor but a mixture of inborn factors and environmental affects. There are several points linked to the genetic basis of sexual orientation, together with the presence of older brothers. Having older brothers in the family tremendously increases the likelihood of homosexuality. Each older brother has a 33% increase in the occurrence of homosexuality. Additionally, older brothers are associated with a statistically gigantic aid in weight at birth.
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