nevetsthereaper: When you start respect evidence from credible sources? It's only your problem you don't know evidence which is there. Why are you lying and discriminating when you HAVE NOTHING? NO EVIDENCE AT ALL THAT GAYS AND LESBIANS CHOOSE SEXUAL ORIENTATION WHERE THERE IS THE BUNCH OF EVIDENCE ON THE CONTRARY? ARE YOU ASHAMED OF YOURSELF?
Homosexuality was once thought to be the result of troubled family dynamics or faulty psychological development. Those assumptions are now understood to have been based on misinformation and prejudice. Currently there is a renewed interest in searching for biological etiologies for homosexuality.
http://www.healthyminds.org/More-Info-For/GayLesbianBisexuals.aspx
The current literature and most scholars in the field state that one's sexual orientation is not a choice; that is, individuals do not choose to be homosexual or heterosexual. In recent decades, biologically based theories have been favored by experts. There is no scientific evidence that abnormal parenting, sexual abuse, or other adverse life events influence sexual orientation. Current knowledge suggests that sexual orientation is usually established during early childhood.
http://aappolicy.aappublications.org/cgi/content/full/pediatrics;113/6/1827
Despite almost a century of psychoanalytic and psychological speculation, there is no substantive evidence to support the suggestion that the nature of parenting or early childhood experiences play any role in the formation of a person's fundamental heterosexual or homosexual orientation. It would appear that sexual orientation is biological in nature, determined by a complex interplay of genetic factors and the early uterine environment. Sexual orientation is therefore not a choice.
http://www.rcpsych.ac.uk/pdf/Submission%20to%20the%20Church%20of%20England.pdf
The conclusion reached by scientists who have investigated the origins and stability of sexual orientation is that it is a human characteristic that is formed early in life, and is resistant to change. All theological, philosophical, and moral debates about how lesbian and gay people should lead their lives and follow their religious beliefs need to take account of these premises.
http://www.churchtimes.co.uk/content.asp?id=60752
The fetal brain develops during the intrauterine period in the male direction through a direct action of testosterone on the developing nerve cells, or in the female direction through the absence of this hormone surge. In this way, our gender identity (the conviction of belonging to the male or female gender) and sexual orientation are programmed or organized into our brain structures when we are still in the womb. There is no indication that social environment after birth has an effect on gender identity or sexual orientation.
http://content.karger.com/produktedb/produkte.asp?doi=10.1159/000262525&typ=pdf