Quote :
What the majority of respected scientists now believe is that homosexuality is attributable to a combination of psychological, social, and biological factors.

From the American Psychological Association
“[M]any scientists share the view that sexual orientation is shaped for most people at an early age through complex interactions of biological, psychological and social factors.”{6}

From “Gay Brain” Researcher Simon LeVay
“At this point, the most widely held opinion [on causation of homosexuality] is that multiple factors play a role.”{7}

From Dennis McFadden, University of Texas neuroscientist:
“Any human behavior is going to be the result of complex intermingling of genetics and environment. It would be astonishing if it were not true for homosexuality.”{8}

From Sociologist Steven Goldberg
“I know of no one in the field who argues that homosexuality can be explained without reference to environmental factors.”{9}

As we have seen, there is no evidence that homosexuality is simply “genetic”–and none of the research itself claims there is.
6} The American Psychological Association’s pamphlet, “Answers to Your Questions About Sexual Orientation and Homosexuality.”

{7} LeVay, Simon (1996). Queer Science, MIT Press.

{8} “Scientists Challenge Notion that Homosexuality’s a Matter of Choice,” The Charlotte Observer, August 9, 1998.

{9} Goldberg, Steven (1994). When Wish Replaces Thought: Why So Much of What You Believe is False. Buffalo, New York: Prometheus Books.

The above article was adapted from two sources: a paper entitled, “The Gay Gene?” by Jeffrey Satinover, M.D., in The Journal of Human Sexuality, 1996, available by calling (972) 713-7130; and past issues of the National Association of Research and Therapy of Homosexuality (NARTH) Bulletin. For an in-depth discussion of homosexuality and genetics, consult Dr. Satinover’s 1996 book, Homosexuality and the Politics of Truth, published by Hamewith/Baker Books.

Sumber : http://www.narth.org/docs/istheregene.html