I believe i may have an "arousal" malfunction...

Not much of a story to this, I suppose. But.. things that MENTALLY gross me out PHYSICALLY arouse me.
I don't know how to explain it. Just anything I consider "EWW! GET IT AWAY!" gives me a boner. It's a curse.. I think it's called PSAS. But I guess there's always the chance that certain images or sounds have developed bad associations through me watching ENTIRELY too much porn. For instance.. I can't STAND it when people chew near me. If I hear chewing or licking or sucking of any kind, I typically leave the room or put headphones on. Or if one of my cats starts "cleaning", I throw things at them. I can't even ride in the car without it happening. Even just a bumpy road is enough to put me over the edge. I've tried not to let it bother me. But it does, without fail. Not that I'm asking how to solve this.. Although it WOULD be nice if there was a drug that did the exact OPPOSITE thing as viagra. But.. the dillema itself.. the mental mix-up... "Is it normal?"