You're arguing now about rape, when this is really about sex with animals. You said consent is an important principle in civilized society, rapes occur frequently in society, and we haven't just crumbled entirely, I don't really think that's valid. You basically said you have a problem with this because you don't think an animal could consent to having sex, how do animals consent with themselves? Some do, some don't. We'll just have to assume they do. Studies have proven some dolphins just go out and rape and kill other dolphins if they are sexually frustrated. But the dolphin civilized society doesn't crumble. This isn't about instincts be honest; you just don't think animals are smart enough to consent to having sex with a human.