Much time, energy, money, and other resources are spent to battle this one out. We can turn to science, reason, or religion, or a combination of all three for answers. We can spend billions of dollars researching genetic code and performing studies. Or, we can turn to our gay loved one and believe them when they answer the question "did you choose this?" Whatever source we go to, whatever conclusion we accept, does it really matter?
Lets say it was Nature. Then what? Well that would meant that it is natural, that it is instinctive and just as real as heterosexuality. It would mean that for some reason, God has allowed people to be gay. But coming to this conclusion doesn't end the internal conflict that gay people deal with in the face of a judgmental, prejudice, and often hateful society. It doesn't solve any problem. The problem is that our gay brothers and sisters are feeling isolated, alone, and unloved which often results in emotional, spiritual, and even sometimes physical death. The problem is that these people are silently suffering and living a life of self-loathing and fear.
Lets say it was nurture. Then what? We tell our gay loved ones that because A + B x 3 / .45y happened in their past, it turned them gay? What then? Can we simply erase their memory of those experiences and reprogram their brains to interpret a false history in a way that the majority deems acceptable? If it is possible, how much time, money, and human testing would need to be done before it is figured out? How much would it take to reorient you to feel the need for an intimate loving relationship with the same sex and not the opposite sex? Concluding that their environment turned them gay would do nothing to solve the problem. However it would still show that homosexuality is "natural" in that it is the natural result of a combination of certain environmental variables. But this still doesn't make these people feel loved and accepted and get them to embrace their individuality.
Ok, now that we have talked about how this argument really shouldn't make a difference, lets see what different people and organizations have said about the issue:
The LDS Church:
“Some people who seek help for homosexual problems may have concluded that experiences from their youth, such as perceived problems with a parent or some other older person, contributed to their inappropriate feelings. Some may believe that they have not consciously chosen to have such feelings in the first place. No general agreement exists about the causes of such problems."
-Understanding and Helping Those Who Have Homosexual Problems – Suggestions for Ecclesiastical Leaders, The Church of Jesus Christ of Latter-day Saints, 1992.
“If someone seeking your help says to you, ‘I am a homosexual,’ or, ‘I am lesbian,’ or, ‘I am gay,’ correct this miscasting… it is simply not true. To speak this way seeds a doubt and deceit about who we really are."
-Bishop Keith McMullen (2010)
"I don't know. I'm not an expert on these things. I don't pretend to be an expert on these things."
-Gordon B. Hinkley (2004)
"'God made me that way,' some say, as they rationalize and excuse themselves for their homosexual perversions. ‘I can’t help it,’ they add. This is blasphemy. Is man not made in the image of God, and does he think God to be ‘that way’?
-Spencer W. Kimball (1980)
Conclusion: Apparently church leaders from all times have been uncertain and unclear and have often contradicted each other. So I guess the only official answer from inspired leaders that doesn't contradict what others have said is, we don't know.
Science:
There have been studies and tests supporting both sides of this issue. There are mormon professionals who have concluded it is nature (
William S. Bradshaw, Ph.D) There are non-mormon (but usually religious) professionals that have concluded that it is environment. However, the majority of psychologists, biologists, and other professionals who have spent much of their lives devoted to the subject seem to agree that homosexuality, at the very least, is to some extent genetic... it is in the DNA to some extent. However, opinions differ as to how much it is dictated by DNA.
Conclusion: We don't really know. We have theories and evidences, but no real provable calculation. DNA is a complex thing.
Logic:
Ask yourself this: When did you choose to be heterosexual? When did you make the conscious decision that you were going to be attracted to the opposite sex? Could it be that homosexuals also did not make a conscious choice?
Think about what would possibly drive a teenager to choose to be gay when that teen grew up in a society that highly values heterosexuality, went to a church where heterosexuality was essential to his salvation, raised in a heterosexual family, grew up in a community that had nothing good to say about homosexuality, and where all the stories of happily-ever-after and the songs of love were all devoted to a heterosexual ideal. If it was environment, why did this very heterosexual environment produce such a very homosexual boy? Why would a teenager choose to be ridiculed and made fun of, hated and judged, at a time in his/her life when all they want is acceptance? Why do so many choose death? Why would they choose a path that would make them feel like their only option for happiness is suicide?
Lastly, look around you. Talk to your homosexual brothers and sisters. Ask them.
Conclusion: Perhaps my logic is flawed... it very well could be. But it seems to me that logic would point to nature. Not that this argument even matters. Not that it does anything to relieve suffering. But take whatever value there is, and lets move on to address the real problems.