Hmm... Lets think about this. Is it cause? Or is it effect? Are you aroused because of the preference or is it your choice to be aroused?
Merely declaring it to be one way or another is meaningless. Moreover, we don't consider other compulsive behaviors with the same sanctity as we do "gayness." If I am compelled to count my steps everywhere I go, or constantly wash my hands, we call that a disorder. Why don't we call being compulsively attracted to the wrong gender a disorder (politics of course).
I wouldn't rely on the illusion of certainty about human behavior based on today's version of science. I think 5000 years of human experience is probably a better gauge on the normality of conduct as opposed to a full blown creation of the most suspect century in the history of humanity (20th). The 20th brought us National Socialism, Soviet style communism, the nanny state, "free" sex, the drug revolution, secular humanism, the unfettered right to abortion and the norming of perversions. Considering the death toll, I'll take the Spanish Inquisition any day.
” is it your choice to be aroused?”
I stopped reading there. If arousal is purely choice, what’s with pedophiles being convicted because they showed arousal under controlled exposure to child porn?