I cannot speak for anyone else, but it was never a choice for me. I did not reach puberty with the arduous decision of either being attracted to boys or girls. One day, sometime during the onset of puberty, I simply found myself quite attracted to the male gender as opposed to the female gender, and that was how I discovered that I am gay.
"Never trust a fox. Looks like a dog, behaves like a cat."
~ Erin Hunter
~ Erin Hunter