Scientific+Evidences+of+GLBT

**The Neuroendocrine Theory of Women’s Sexual Orientation ** The existing neuroendocrine theory about sexual orientation predicts that prenatal exposure to unusually high levels of so-called male hormones can influence women’s sexual orientation. It hypothesizes that “if a female fetus is exposed to high levels of testosterone in the latter half of gestation, her brain will function as a male brain. Later in puberty, one expression of this male brain functioning will be a preference for female sex partners” (Veniegas & Conley, 2000). Since insufficient studies have been conducted, it is still unknown if prenatal exposure to abnormal levels of testosterone actually masculinises women’s brains. Therefore, we cannot say there is enough evidence to support this hormone hypothesis to be a correct one. - Veniegas, R. & Conley, T (2000)
 * Scientific Evidence of GLBT **

**The Genetics of Women’s Sexual Orientation ** Researchers have investigated the relationship between genes and women’s sexual orientation. There is evidence to suggest that homosexuality “runs in families”. It means that there may be a genetic underpinning to the development of sexual orientation. A similarity of sexual orientation between twins is found. Studies showed that lesbians were more likely than were heterosexual women to have lesbian siblings and lesbian relatives. Based the available data, we may conclude that genetics play an important role on female’s homosexuality in families. However, the other possible factors that can also affect a female’s sexual orientation are environmental factors. Social and cultural factors within the same family could influence the likelihood that a woman will recognize or act on same-sex attractions. If a female grew up with a lesbian sister or mother, she might be more ‘acceptable’ to the homosexual identity. -Veniegas, R. & Conley, T (2000)

“US researchers are finding common biological traits among gay men, feeding a growing consensus that sexual orientation is an inborn combination of genetic and environmental factors that largely decide a person's sexual attractions before they are born.” - US researchers find evidence that homosexuality linked to genetics

All in all, despite there is a growing belief in biological explanations for sexual orientation, there is no enough evidence that biology plays a major role in determining whether women are heterosexual, lesbian, or bisexual (Veniegas & Conley, 2000).

“Even if genetic and neuroanatomical traits turn out to be correlated with sexual orientation, causation is far from proved” (Byne, 1994). We still cannot answer the question “what the causes of sexual orientation are”. It is still in debating that homosexuality is inborn (biology factor) or a personal choice, or affected by a combination factors of genetic and environmental factors.

According to Newton and Risch (1981), homosexual behaviour is criticized for being “unnatural” and "abnormal" as it does not represent the statistically most common form of sexual behaviour. In fact, homosexual behaviour not only occurs in humans, but also common occurs in other species, domesticated and wild animals, for instance.

media type="custom" key="11616580"
 * Cartoon Video: //Is Homosexuality a Choice?// **