Is sexual orientation determined at birth or later in life?

There was a scientific study done on this before. The findings of that was that we are born with a sexual preference. Straight, gay, bi, and anything in between. It was even stated that peadophiles are born this way because of it. This is why there is no choice and pedophillia can't be treated. It's a crossover in the brain which tells them and us what they find erotic or pleasing...I still hate peadophiles guts to the limits and would gladly dig a hole for any of them.