I hear over & over again through entertainment media (like 'Law & Order' shows & other legal shows) that Raping & Pedophilila is not about sex pleasure, it is about power. Scientific research says that Raping & Pedophilila is about sex pleasure & it is about power. So it is reasonable to assume Zoophillia is the same.

Whether it is sexually pleasurable or power difference or both, it really does not matter. It really is that it is not what the animals want. You do not need to completely be able to communicate to the animals, like done within same species & races. There are behaviors that communicate things, just need someone that been around-knows them. Do not need a good Animal Behaviorist or someone who pays attention. Out of their species & not expressing a want for it, before it happens the very first time &/or the animals are trapped.