Certain books (example: the story from last chapter)
Sometimes "smut" in books
Whenever I'm shipped with someone
Whenever someone jokingly hits on me
In the shower
In the bathroom
When someone is talking about how attracted they are to someone that I already occasionally get intrusive thoughts surrounding.
Talking to someone I regularly get intrusive thoughts about
Prolonged eye contact in conversation
Sometimes they come up "just because"
There are so many more triggers that I can't list them all, but these are the main ones.