Yes, I get that they also cannot consent to being killed and eaten, but we generally try to be humane about the killing portion of that these days, and fucking something to death is generally frowned upon in polite society.
But how often does it involve harming the animal? Fucking something to death would fall under animal cruelty to me.
Exactly. Most often I would assume the animal is pleased. Especially if it initiates the behaviour. Consent is being drummed up as a false argument because people know they can't legislate the yuck reflex. The same appears to be happening in regard to big age differences between humans fucking. If she isn't old enough to consent to sex, she isn't old enough to consent to sex. Him being 18 or 28 really shouldn't matter, but it does to us, because it disgusts us.
The reason for the age bit is that 18 is far less likely to be manipulating her into it than 28 is.