To answer your poll, it would be depending on the content.
Sexual/fetish/disgusting content doesn't affect me anymore, and I'll click it.
The ones that do affect me are killings. I saw the beheading, it was ghastly, but not the worst by far. 2 remain in my memory that I wish I could erase.
One was a young male going in the interrogation room of a police station, smoking a cig, and then calmly taking a gun from his pants and shooting his own head off.
The other is a blond girl whimpering with a man pointing a gun to her head. After a few squeaks he shoots the gun.
In both cases what shocked me the most was the absolute finality of the shooting. They just flopped there, inanimate as a rag.
/shudder