I have an obsessive fear of tail, most especially triggered when I'm around other people. It all started over a game Pin the tail on the Donkey. The obsessive part is the fact that I never really stop thinking about it, and if I'm alone, I would always stare at anything considered a posterior. It's nearly impossible to break away from that kind of concentration. However, if I become self-conscious at the very least, I absolutely need to avoid it.
When night falls, I get even more obsessive. What happens is that when everything settles down in the house, I start a ritual. You know, I attempt to masturbate... I really, REALLY want to abstain, however that is not going very well. How it goes down is all about the distress I "need" to put myself through, either through a game or mentally (pictures only aid that). If you don't think THAT is weird and interesting, try this: countless pictures of cars. If that doesn't seem relevant: have you ever heard of an Aston Martin? The thing about those kinds of cars that drives me crazy is the spoilers.
There's another thing that I had gotten traumatized over, however I've already gone over a lot of it with my therapist. But for the sake of discussion, I also have a fear of transformation. Words such as shape, form, or beast will especially arouse me.
Now to sum up my mental state: I'm seriously paranoid and self-conscious about everything I do, yet when night falls and I find comfort, I have almost zero self-control. If I have a thought, any thought, it doesn't escape easily.