Pedophilia and bestiality are fetishes, not sexual preferences. Take Michael Jackson as an example. He was supposedly into little boys as the media claims. Not saying either way, just using him as an example. That would make him homosexual, but with a fetish for young boys, as opposed to someone who is a rapist that is straight and he has a fetish towards little girls. Same can be applied to bestiality. If a person with this fetish is open to male AND female animals, then they are bisexual or bicurious.
BTW, the correct term for bestiality is zoophilia.