How do genes influence our sexuality? The question has long been fraught with controversy. An ambitious new study — the largest ever to analyze the genetics of same-sex sexual behavior — found that genetics does play a role, responsible for perhaps a third of the influence on whether someone has same-sex sex. The study of nearly half a million people, funded by the National Institutes of Health and other agencies, found differences in the genetic details of same-sex behavior in men and women.
Largest study of gay brothers homes in on 'gay genes'
What Causes Homosexual Desire - Dr. Cameron
Homosexuality can refer to both attraction or sexual behavior between people of the same sex, or to a sexual orientation. When describing the latter, it refers to enduring sexual and romantic attraction towards those of the same sex, but not necessarily to sexual behavior. Most scientist today agree that sexual orientation is most likely the result of a complex interaction of environmental, cognitive and biological factors. Although homosexuality does not appear to be adaptive from an evolutionary standpoint, because homosexual sex does not produce children, there is evidence of its existence through human history. Although a number of biological factors have been considered by scientists, such as prenatal hormones, chromosomes, polygenetic effects, brain structure and viral influences, no scientific consensus exists as to how biology influences sexual orientation. Reference Terms.
Many Genes Influence Same-Sex Sexuality, Not a Single ‘Gay Gene’
Adapting to endure humanity's impact on the world. National Cancer Institute on Unsplash. When studying vulnerable groups, scientists should always be aware of the context their studies take place in.
For example, a study at the University of Toronto showed that each older brother a man has increases his chance of being homosexual see Focus, June , p The inherited component of homosexuality seems to be much weaker in women than men but culture, lifestyle and early sexual experiences are probably more significant than genetics for both genders. Certainly, upbringing and culture have a big impact on the way that people acknowledge and define their own sexuality. Studies with identical twins have shown some evidence for an inherited component to homosexuality.