Not content with describing JK Rowling as 'gemein' mean, Duoling's German course is busy normalising BDSM/kink to users of all ages. Here - image attached - we learn that single Dad Eddy has a leather suit and a whip in the cupboard. Duolingo encourages users to sign up via its family plan. But I wouldn't really fancy explaining this one to younger members of my own family.