Maybe just maybe, you are confused because you live your life after a moral code that doesn't aply to humans. Free your mind and I'm sure you'll understand. Read a little Nietzsche, Lacan, Focault and Deleuze. And I think it will become a lot clearer.

Normality and mental sanity is a myth. There is no natural equilibrium for the human mind where we are in harmony. And there's plenty of instincts that drive us forward.

edit: and above all nobody really knows what it is that makes us pervy. Psychology isn't really a science. They're all just guessing. So what ever feels good for you, probably is what you should be doing.