Terri Windling, in The Armless Maiden and Other Tales for Childhood's Survivors, a collection of stories and poems which tell some old märchen in new ways, has this to say about märchen, which she refers to as "fairy tales":
The notion that fairy tales were exclusively meant for children's ears is one that came about largely in Victorian times, when the adult storytelling tradition was widely replaced by printed novels and a new fashion for stories of social realism. As the old oral tales were banished to the nursery, the more violent or sexual stories were changed, watered down to make them more suitable for "innocent ears." Even folklore enthusiasts like the Brothers Grimm used a heavy hand to edit the tales, changing, for instance, cruel mothers and fathers into wicked "stepparents" instead (Windling 13).