This is a dumb question. Sexuality is NOT genetic, and it's completely a person's choice. In fact, bats have the highest homosexuality rate of any animal because they can't see, not because they are genetically attracted to male bats.
A person can say that they are gay, and that makes them gay. One can say that they are straight, then they are straight. The only real question that should be here is "If you could be a hermaphrodite or asexual, which one would you be?"
Sexuality is already a choice, there is NO REASON to make it seem impossible to say "I'm gay" or "i'm straight".
I'm not trying to sound like a dick, sorry if it comes off that way but this topic is like saying "would you rather inhale or exhale?"