But every Baha'i person could perfectly easily understand how immutable sexual orientation really is.
I confess, I've never had an honest answer from a heterosexual person to this thought experiment, but that doesn't mean they couldn't do it -- if they wanted to, if they really sought understanding.
And that thought experiment is simply to ask yourself, "if I were commanded to change my sexual orientation, how would I do it, could I even accomplish it?" I do not mean just to give in an do it with an individual of your own gender a time or two. I mean really to want a person of your own gender, for the rest of your life, and when seeing a member of the opposite gender (to which you are presently oriented) -- even naked -- to experience no desire, and perhaps even just a little revulsion.
And if they really, really thought about it, they could only answer, "I couldn't do it." And of course they couldn't. nobody expects that they could.
But it is what they expect of gay people like myself.