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Well, people have changed sexual orientation. Straight to gay, lesbian to bi, gay to transgender and vice versa.

If that's not "a choice" I don't know what is. Just because it's not often a choice doesn't mean it can't be.

In the same way that some days I am happy and other days I'm sad, doesn't mean that my mood is choice.

Well, to keep with the example, people can also chose to be happy or sad. Some revile in being sad -- others opt to see the positive side.