Let's not forget the cheapest option for those real emergencies: shitinmytoilet.com
All we need now to cover all the bases is a rent a my wife for the evening sorta site.
Edit: I love the comment by DoJo* there, very germane: "We're all clear, right, that there is no possible world in which this does not lead to someone advertising a bathroom and then filling it with 63 hidden webcams and selling the videos on the internet? We all aknowledge that it would be impossible for that NOT to happen, right?"