First: No, we do not. There's a certain special kind of excitement that comes from doing something that you aren't supposed to. Not an adrenaline rush, but the physical result is real. For a lot of people, it tends to get them sexually excited, or just more so if you already were. I wish I could remember the term for it.
, you have a medical condition that caused that to happen, so I wouldn't use yourself as a base for comparison.
Third: I hate to darken the mood, but many people grow into zoophiles as a result of childhood abuse, or just because they started exploring their sexuality at a dangerously young age.