This is going to sound like a lie but I swear it's true. When I was eight I watched my brother's porno (VHS mind you) and some girl got a huge dick in her ass and was screaming like hell.. This threw me and I became really scared of being penetrated. This wasn't a phobia of being raped but rather that a penis would appear and penetrate me. I used to clench my butt before going to sleep and whenever there was a dull moment and I started thinking about it. I especially remember sitting in the back seat of the car cleanching like hell and being genuinely scared of a dick ripping through the seat and penetrating me.