There is no link in that opinion peace that even begins to back up their position. Could that be because there is no scientific evidence, or a scientific consensus, that people are born gay? Would you like to admit I am right, or do you want to throw another opinion piece at me that doesn't prove me wrong?
First, scientific ‘consensus’ is meaningless and a bullshit term. By the very core of what science is and means; consensus is meaningless. If consensus meant anything, the earth would still be the center of the universe.
Second, I would really like to see this ‘proof’ that gay is a choice rather than something that we are. I think that you are blowing smoke because that is not true. Science is leaning in the other direction in that concept. Gay is not a choice. Here is a new theory that might just shed some light on the fact that there is no gay gene but that there is a relationship with genetics that causes homosexuality:
New Insight into the (Epi)Genetic Roots of Homosexuality | TIME.com
And time does some more articles that are interesting and cover such questions as why does the gay tendency in genes not die off:
Born Gay? - TIME
Interestingly, it shows that of you have gay relatives, you are far more prone to be gay. Again, this challenges the supposition that such things are choices.
Now, where are your scientific researchers that find gay is not due to conditions in genes and birth?
Last, the conditions that create gay people, whether a decision or born or environmental, are utterly meaningless in the legal debate. If you have a legal right to marry then that right extends universally and the state has no right to define what contract you can enter with another consenting adult. If you do not have that right then the state should not be involved. They really should not be involved anyway but that is another thread.