What's the difference between a Perv and someone with an unusual Fetish?

The meaning of the term perv varies wildly from person to person. I rarely use it in a negative context other than someone [i]forcing[/i] their sexual tastes on someone in some way. You can do whatever you want on your own, I have my own tastes that some may find questionable, I'd just prefer you not shove it in my face please.