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Studies on gay twins

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There is a common belief among liberals that people are born either gay or straight. Conservatives tend to believe that sexual orientation is actually sexual preference, which is chosen by the individual. This page represents a review of the scientific literature on the basis for homosexual orientation. Are people born gay or straight?
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Nature vs. Nurture: The Biology of Sexuality | BU Today | Boston University

Her mother, Beverly Bushfield , was a homemaker, and her father, Thad Harold Harden, was in the military. The family relocated often -- she first became interested in the theatre when the family was living in Greece, and she had attended plays in Athens. Harden began her college education at American universities in Europe and returned to the US to complete her studies at the University of Texas in ; went on to earn an MFA at NYU, and, thereafter, embarked on her acting career. Although she had acted in a movie as early as , in the little-known The Imagemaker , her first mainstream role, coming alongside some TV movie work, was as a sultry femme fatale in the Coen Brothers' cleverly offbeat homage to the gangster movie, Miller's Crossing Harden received good reviews for her sultry performance as Verna, a seductive, trouble-making moll. Harden thereafter worked steadily in supporting roles, including the portrayal of Ava Gardner in Sinatra , a television biopic about Frank Sinatra. Harden also worked in the theater and, in , was part of the Broadway cast of Tony Kushner 's "Angels in America", playing Harper, the alienated wife of a closeted gay man.
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Straight And Gay Identical Twins Could Help Us Learn Where Sexuality Comes From

People choose to be gay. They are making an immoral choice, which government should discourage. Sexual preference is biologically determined.
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Behavioural genetics , also referred to as behaviour genetics , is a field of scientific research that uses genetic methods to investigate the nature and origins of individual differences in behaviour. While the name "behavioural genetics" connotes a focus on genetic influences, the field broadly investigates genetic and environmental influences, using research designs that allow removal of the confounding of genes and environment. Behavioural genetics was founded as a scientific discipline by Francis Galton in the late 19th century, only to be discredited through association with eugenics movements before and during World War II. In the latter half of the 20th century, the field saw renewed prominence with research on inheritance of behaviour and mental illness in humans typically using twin and family studies , as well as research on genetically informative model organisms through selective breeding and crosses.
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