Why? This fantasy usually involves an animal with human intelligence and ability to communicate consent (such as a werewolf). Or it involves fantasies where both parties are animals (such as furry fantasies).

For fantasies that don't involve this, how is it more disturbing to you than rape fantasies (which are INSANELY common)? The nonconsensual aspect is the same. Usually the fantasy actually involves being ravished by a strong powerful animal like Bigfoot, or a dinosaur, lion, wolf etc.

For me, my partner and I have animal alter-egos that we sometimes roleplay as during sex. It's a way to tap into our primal animalistic side. In my opinion, there is nothing disgusting about this, since it doesn't involve anything nonconsensual or unsanitary.

We need to remember that humans ARE animals. And the reason we don't fuck other species is because we can't communicate with them and get consent. But in a fantasy roleplay, this problem disappears. So why the judgement?