Generally this conversatíon is a non starter. But: can dolphins consent?
I mean they don’t care about you consenting since they’re rapey AF but - “person-like” animals such as orangutans, dolphins, corvids, could probably offer consent in a manner that’s ethical.
I don’t think anyone should fuck any of the above, or even could fuck a corvids, but there are legitimate implications in ethics of an animal is capable of consenting to anything.