Homosexual

I'm very supportive of all sexualities.
But, I'd like to discuss the idea of choice.
Is homosexuality something you were born with? And on the other side- is heterosexuality something you were born with?
Or, does your sexuality lie upon a thin line of Kinsey scale?
Can you be "Homosexual" and revert or convert to heterosexual?
Or are you born just one, and that is how you live your life out?
Do the majority of people fall somewhere within a scale where they find themselves attracted to both sexes, maybe 99/1.. Or 1/99.