It isn't a choice. Your sexuality is defined by who you are attracted to.
Because you say so? Because some other people say so? Because you all agree?
After all this time, that's ALL you've given in defense of this position, and it means NOTHING.
Sexuality IS a choice. No one even bothers to dispute this unless they are a fool or a liar trying to forward the homosexual agenda.
My solution is this, elimination of government marriage. Marriage stays a religious term and, in the eyes of the law, everyone--gay or straight--is in a civil union.
There still needs to be some distinction between homosexual civil unions and heterosexual civil unions.
Even if you're going to stubbornly stick to your (il)logic that suggests that sexuality is a choice, you aren't proving it isn't biological. Even if it's only a biological tendency.
Attraction is a biological tendency, but attraction and sexuality are NOT the same thing.
Of course, the whole thing is disingenuous. I'd bet quite a bit that if heterosexual marriage became illegal tomorrow you'd die single. Most people don't have sufficiently flexible sexuality to be happy with a person of the gender to which they are NOT particularly attractive. I know I wouldn't be. Odds are you feel the same way, but of course you'll deny it.
The choice actually made by any individual (including you and I) in any given circumstance doesn't somehow prevent it from having been a choice in the first place. The choice of the majority of people doesn't prevent it from being a choice in the first place either.
Regardless of what choice is actually made by anyone, the majority, or whatever, the fact that it IS a choice doesn't change.