Confusing combinations

Today my mom rifled through my things (ugh) looking for something that wasn't there, but I later found my books rifled about and realized she had rifled through "Catholicism" (I am not Catholic but like to read about religion) and "The Good Girl's Guide to Bad Girl Sex" (the title is iffy, but it's a good read).

Now I'm thinking about this and realizing she was either horrified or just really confused.