lol, I dunno what zoophilia is but I think obsession is more superficial. Haha. I like to use this question:

If you get a call from GirlA at 3am asking you to pick her up 'cause she's stuck without a ride in a city 12 hours (driving) away. Would you pick her up?

(Then again, actually, that may not apply on 4-chan so much, with what all the long distance relationships and whatnot, so I guess ask yourself if you'd take a bullet for her, hahA)