I am very intrigued by your assertion that sexual orientation is a choice because it just doesn't make any sense to me. Across all of the threads discussing homosexuality on NSG recently I have yet to read a single logical explanation of how someone can possibly 'choose' what or who they are sexually attracted to.
I assume you are straight? In that case do you choose to fantasise over women, not men? If so I assume you could therefore choose to be turned on by thinking about men instead if you really wanted to? How old were you when you decided you wanted to be attracted to women instead of men?
If you can't provide logical answers to any such questions then it suggests it's your prejudice that is the issue and not the question of whether someone can 'choose' to be gay or not.