My grandmother doesn't go out of her way to read adult literature because years ago she gave herself moral standards about the entertainment to consume (this included forgoing R-rated movies). Fair enough, but not all adult literature has sex in it, which I know is the biggest concern my grandmother has, so I don't know why she doesn't go out of her way to, I dunno, read up on the older books, the classics. Or turn to fantasy novels (she actually believes in fairies, so you'd think she'd be more than willing to read fantasy more). So she turns to YA because somehow she likes the stories, except YA novels can be extremely sexually-charged without the sex. So I don't get it. Also, she's written adult books herself including sex scenes, and she excused it with "I was telling a STORY!", or was doing it to give the characters more dimensions, something to that effect.
I love my grandma, but even before I learned about the drama in YA I thought her reasons for reading only YA novels made her sound like a pearl-clutcher. Which is funny, I just know she'll scoff and roll her eyes at the cat-fighting going on in the industry should she ever hear of it, but it still won't change her mind about reading those books even though a lot of them she deemed to be wastes of time after going through the entire series.