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As of 2014, the latest theories suggest it is a combination of gene sequences and prenatal hormones. The latest findings are showing it's more genetic than we previously thought.

A number of reasons and scientific evidence suggest that homosexuality is based significantly on genetic factors (as well as prenatal ones):

  • Family studies have found that homosexuality runs in the family. Generally, homosexual individuals have relatives who also display homosexuality.
  • Twin studies have shown that homosexuality is more common (the correlation is stronger) among identical twins than in fraternal twins (proof of a genetic component).
  • Genetic engineers have manipulated fruit flies in such a way that males perform courtship practices on other males, and females to females.
  • As for the prenatal component, studies have shown that women who were pregnant in bomb-struck or stress-prevalent environments, tended to have a higher percentage of homosexual offspring (40%).
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