Being gay is a fetish.

[Heywood]

Premise 1: Homosexual behavior is unnatural and immoral.
Premise 2: Gays choose to engage in homosexual behavior.
Conclusion: Gays make a willful choice to engage in immoral behavior.

I accept premise 2.
But for premise 1, it's not "unnatural". This has already been demonstrated.
For those of us who don't follow arcane, vague, random rules, it's not immoral either.

First lets define natural.  There are two ways it is used in this debate.  The pro gay crowd defines natural as "occurs in nature".  The anti-gay crowd defines natural as "the usual and ordinary course of nature".  Very different meanings and each is equally valid.

Now you don't refute the anti gay argument by using a different definition of natural then they are using.  Using a different definition than they are using is refuting a straw man argument.  When the anti gay crowd calls homosexuality unnatural they mean homosexuality isn't the usual and ordinary course of nature.  

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That's not what was being described, and you know it.

We don't know what causes homosexuality.  It can be something acquired.....like a flavor palate.