The reasons behind why people are gay, straight or bisexual have long been a source of public fascination. Indeed, research on the topic of sexual orientation offers a powerful window into understanding human sexuality.
The day before, the bill was finally passed to cheers and singing at about 6 pm, after months of debate and controversy. Malcolm Turnbull via Storyful.
The relationship between biology and sexual orientation is a subject of research. While scientists do not know the exact cause of sexual orientation , they theorize that a combination of genetic, hormonal, and social factors determine it.
Epigenetic theories of homosexuality concern the studies of changes in gene expression or cellular phenotype caused by mechanisms other than changes in the underlying DNA sequence , and their role in the development of homosexuality. However, epigenetic theories tangle a multiplicity of initiating causes and of resulting final effects and will never lead to a single cause or a single result.
In a large study of more than , men and women in the United States, United Kingdom and Sweden, researchers discovered four genetic variants that occur more often in people who indicated on questionnaires that they had had same-sex sexual partners. The other two influence sex partner choice for both men and women.
New research is offering the first piece of evidence for an idea that has been proposed before: The idea that sexuality is a choice is an archaic idea.