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Preventive Medicine. King, M. A study of all adult twins in Sweden more than 7, twins [12] found that same-sex behavior was explained by both heritable factors and individual-specific environmental sources such as prenatal environment, experience with illness and trauma, as well as peer groups, and sexual experienceswhile influences of shared-environment variables such as familial environment and social attitudes had a weaker, but significant effect. Biological theories for explaining the causes of sexual orientation are favored by scientists [1] and involve a complex interplay of genetic factors, the early uterine environment and brain structure. Endocrine Development. What Do They Show?

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Genes and behavior:

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This hypothesis is an extension of the theory of kin selectionwhich was originally developed to explain apparent altruistic acts which seemed to be maladaptive. Social attitudes Prejudice Violence. What is it like to be the mother of an addict?

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Some people who are attracted to the same gender can be so afraid of, or put off by, the social stigma against same-sex couples that they marry and have children with a person of the opposite sex despite being primarily or uniquely attracted to those of the same gender.

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