If I was to have sex with one animal it would be a horse. That is a beautiful animal. And when you have sex with a horse, you know you always have a ride home.
Mary had a little sheep, With the sheep she went to sleep. The sheep turned out to be a ram, And Mary had a little lamb.
Start with homosexual behavior and just morph out from there. Bestiality, sleeping around with this woman and that woman and that woman and those men.
I've read that male dolphins try to have sex with humans, and female apes solicit sex from humans. What is wrong with giving them what they want, if that's what turns you on, or even just to gratify them?