I dont get why adults deprive themselves of watching horror films, my wife was the same. They deprive themselves of a whole genere of film making.
Mind you, i watched the Evil Dead and An American Werewolf in London (classic shit your pants films, with no context) when i was about 12 and that sort-a desensitised me to visual horror.
In my latest phase of film hunting, nothing scares me out there, but some snuff films are too much for me, thats the stage when you should question if you should watch something or not