I find some preachers (ie. Alex) erred in arguing that it does not matter whether homosexuality is a natural trait or not, as long as the concluding debate results in holding up the Lordship of Christ.
Although the concluding judgment is flawless, the hasty overlook of nature vs. nurture of homosexuality can be devastating in theological analysis.
They fail to realize when one argues for homosexuality on the basis of nature, one is saying it is God's doing. Therefore, it invalidates any contrary biblical arguments.
Therefore, "sexual orientation" as a natural thing is a very serious stance because it is completely not the same as "sexual preference".
It would give the opponent a claim to ridicule: If someone is born without hands (or born homosexual), how can you tell him it is not polite to eat with your foot (repent from homosexuality)?
Notice that this natural tendency is not viewed by gay rights proponents as the same as the tendency to sin. One cannot "trick" one's opponent to presuppose them as the same thing without hitting at the root of this confusion.
On the nature of homosexuality, while medical science is still trying to proof that, I shall first call the bluff by pointing out that if certain homosexual behavior that is observable in some animals or young human children shows that homosexuality is indeed a natural Godly making, then it is equally fair to say that most if not all in some if not most cultures are certainly not heterosexual by nature since they usually find such courtship disgusting when they were boys and girls.