InformedIgnorance
Do you 'know' or believe?
Cultural attitude and general social disgust aside, it is the inability to establish whether or not the animal is aware of what is going to happen (which is probably much easier to tell if the animal exhibits signs of arousal prior to the event) or consents to that act (which is much more difficult to determine, unless the animal is the dominant in the sexual union and outside that sexual union does not have the threat of punishment by the partner for failure to comply and does not rely on the partner at all for food etc... which is MUCH more difficult, perhaps impossible)
Our inability to established informed consent is the most reliable objective reason for any reservations on the morality of bestiality.
Our inability to established informed consent is the most reliable objective reason for any reservations on the morality of bestiality.