When you read a lot of fiction, you wade through a lot of language (the kind I don't use) and activities (the kind I don't do). -- And that's just the good guys!
Sometimes it is refreshing to just read something I can trust to not assault my brain with garbage surrounding a perfectly good story. One of our local libraries (the one a county away where my husband works) puts these little "Clean Read" markers on books that do not include yucky stuff. I have not checked what their criteria is. ( I just read a murder mystery that contained no bad language - is it a 'clean read"? After all, there is violence and murder. ..) But I appreciate their taking the time to identify what is not in this book.