@People suggesting some sort of quandary about killing vs raping animals.
There really isn't. We butcher animals for food because, for large swaths of the population, humans as omnivores need meat to survive. Raping anything, especially beings that can't consent, is pretty morally heinous and certainly not needed to survive. Ergo, it is much more ethical to butcher animals than to rape them.
A similar veined comparison would be how it is more moral to kill someone in self defense than to disable them and proceed to rape them.