I meant that I know of at least half-a-dozen people who were gay and are now straight and visa-versa. It has been my experience that people will interpret their history to reflect their current status. People who are now gay, but lived straight, will say "I always knew I was gay" or "I always knew I was different" and the straights who were gay say "There was something missing" or "I never felt comfortable...".
What it boils down to me is that there is more choice involved than some would like to admit.
Sure, people choose whether or not to act on their impulses. It is the attraction that is not a choice.