Perversions and fetishes are in many ways interchangeable. What some might consider odd and perverted, others not an issue, so perversion really is in the eye of the beholder. To the perverted ones, it truly is a matter of ,”How can something so wrong, feel so right?” It’s all in the perspective.
Most people would likely agree that if a perversion, while distasteful, as long as it’s not involving an unwilling person, child or animal, is more acceptable.
A man turned on by shoes isn’t viewed as a potential threat, just maybe a bit odd, one turned on by children is viewed as a threat.
Perversion is strictly in the world of man, animals do not bother with perversions. While there are many species that exhibit homosexuality and masturbation, perversion as we know it in the world of man does not exist in the world of animals. Maybe they have too much common sense to spend time on such time consuming behavior.
Animals also do not worry what others think of them, it’s not an issue, they act on instinct, man on the other hand does usually care what others think of us and to fit into society we have to keep some behaviors secret. We know that most people masturbate and have sex, and consider these fairly expected behaviors. But we don’t go doing it in public view in most situations, we realize this is a private thing. If it was only done in public, and the person only able to get off if was being done in public, then it would be considered a perversion.