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Here, on Wikipedia I found this information while I was looking up some more biological factors in the cause or proper false cause of Sexual Orientation.
The link is http://en.wikipedia.org/wiki/Biology_and_sexual_orientation
This is the paragraph in question.
There is no consensus among scientists about the exact reasons that an individual develops a heterosexual, bisexual, gay, or lesbian orientation. Although much research has examined the possible genetic, hormonal, developmental, social, and cultural influences on sexual orientation, no findings have emerged that permit scientists to conclude that sexual orientation is determined by any particular factor or factors. Many think that nature and nurture both play complex roles; most people experience little or no sense of choice about their sexual orientation.
A number of biological factors have been considered by scientists, such as genetics, prenatal hormones, chromosomes, polygenetic effects, and brain structure...
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