Rent-a-Guardian-Angel

How many times have you seen this happen: someone goes out with his/her friends to drink, carouse, and pick up members of the opposite sex, and subsequently wakes up next to someone who he/she wishes he/she wouldn't have. Friends can sometimes help prevent such things from happening, but in just as many cases they are either too drunk or busy with their own romantic prospects to care, or they take a perverse delight in setting their friend up for a shock in the morning. What I'm proposing here is a service where a person can rent a "designated conscience", so to speak. This "guardian angel" would remain sober, and keep his/her charge out of "trouble", whether said trouble takes the form of fights, robbery, or even going home with someone that doesn't meet criteria arranged at the beginning of the evening.
In a more serious vein, the "guardian angel" could serve as a more traditional bodyguard, but I had originally envisioned this in regard to avoiding potential unpleasantness associated with having a night out. Also, for an additional fee the "guardian angel" could remotely monitor his/her charge (using established surveilance techniques and technology), for those times when the client needs to appear alone.