I think you only have to look at the large number of people who have been disowned, abandoned, put through hell by either themselves or others around them, to know that no one makes the choice to do that.
People struggle with accepting their sexuality every day, I don't think it's a choice.
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Survival instinct discounts the choice theory I feel, as you only have to look at England when the death penalty was still a punishment for homosexuality, you'd think if it were a choice that people would just go straight, for the love of wotsits. However, they didn't, and that says something to me.
I also agree with this:
actions are choices; feelings/thoughts/sexuality/involuntary muscle movements : not choices. just my opinion :)
i dont think sexuality is a choice, you can choose to act straight etc and be indenial but truely what you feel you have no choice in :)
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The current "fad" seems to me to be about genuine fluidity of sexual orientation that people could not express in previous, more oppressive times - ie, it's not about choosing at all, it's about having freedom from having to make choices based on what one currently finds attractive