But currently, there are no known non-human species that have the ability to consent to such a thing.
What do you base this off of? Non-humans do consent with eachother, through the use of various behaviors.
And if they do have the ability, how are we supposed to know that they are consenting?
By examining the behavior of the non-human in question. If they display the courtship rituals of that species, then we know that they are interested in the human.
Personally, I think beastiality is disgusting.
It's not a pretty picture in my mind either, but then again, I don't view homosexuality very high on my list of appealing things either. This is because I am merely not attracted to such things. However, certain individuals are, and we have to try to understand them.
Animals are not capable of consenting to sex. Sex without mutual consent is wrong. Therefore, beasiality is wrong.
But then, is all sex that animals may or may not have with each other rape?
Please note, people, I am not a zoophiliac. I just feel that people who have an attraction to non-humans should be allowed to pursue their interest.
What is the factor that is morally wrong? Is it because all interspecies sex is unnatural? Or is it just wrong for humans? Non-humans do have interspecies sex. There have been accounts of chimpanzees (our closest living relative), having mutually consented sex with baboons. We know that it is mutuallky consented, because we can see them both enacting the flirting actions of their respective species. Many a time non-humans in zoos have been recorded to have "come on" to their human keepers. Dolphins are quite common in this. Is this not consent?
For those out there who might base their beliefs on homosexuality being natural because non-humans practice it, then you must also, by logic, agree that interspecies sex is also natural, because non-humans practice it.