Not my usual flavor, but:
Intrusive thoughts are NOT fantasies. That is why they are intrusive. They are literally a person's brain digging up what they consider to be the most inappropriate, disgusting, horrific shit and slapping them across the face with it.
As a person with OCD, I can tell you firsthand: Intrusive thoughts are terrifying. They are sickening. They can send you into a panic attack. They make you want to do drastic things to 'fix' yourself (even aside from regular compulsions). If you don't know you have OCD, life is an absolute nightmare because you become convinced that they are somehow a reflection of who you are. They make you obssessive and hypervigilant during literally all your waking hours, and it is painful.
Intrusive thoughts are invaders, not a manifestation of secret desires. All of them. Without exception. Hence the fucking name.
I will not tolerate the mischaracterization of any form of OCD on this blog. If you think that it is acceptable to tell a person with OCD that their intrusive thoughts make them disgusting, dangerous, or immoral, kindly block me.