There is a new version of Airbnb, called Kinkbnb, intended to fill that specific need. (Sidenote: Although we definitely get what they're doing with the name, the idea of breakfast being served in a sex dungeon is something we'd rather not think about.) With Kinkbnb, you can book a stay in such places as "The Office, Portland's boutique dungeon," which includes a "spanking horse," and "Prison Cell near Leipzig, Germany," which is pretty self-explanatory.