you are describing the extreme end of a rape "scale" for lack of another word
let me illustrate
a woman (just for the purpose of this example... i know it happens to men too) is unknowingly given a drug
taken to a house and given a candle lit bubble bath, laid down on 3000 count egyptian sheets. he goes down on her, gently carressing, slow tender sex with a condom follows, she is tucked in to sleep, woke with a kiss and breakfast in bed.
not a mark on her to show from the experience
it was rape! he had a choice of what he was doing... she didnt.
i would never persume to think when a human wants to have sex with any species of animal, that he or she meant to harm it, torture, or what have you
but i dont care how scrumptious a biscuit, the dog (for example) is given when its over, it was rape cause one party (the human) had a choice... the animal didnt
really tho, my whole purpose was to point out that we should not be talking like the animal has any consent in the matter ... not whether its right or wrong or moral etc