"Where sadism is not present, there is considerable room for doubt as to whether there is any cruelty. It has always been noted in fact, by ancient historians and up through Kinsey in our own time, that animals tend to become affectionately attached (not only physically) to humans who have sex relations with them, and sometimes have even been known to forsake intercourse with their own kind in testimony to their preference for relations with humans. Whatever one may think of bestiality, this does not sound as if it were an act of cruelty so far as the animal is concerned."
"One seems forced to conclude, the animal derives a considerable psychical and/or emotional pleasure from sexual contact with a being of a higher nervous, emotional, and intellectual organization, who is somehow able to provide the animal with non-material rewards which another animal is not able to offer."