I have a friend who used to be a prostitute in Los Angeles (she's now soon about to get a PhD in Psychology) and she told me that I wouldn't believe how many old, rich businessmen types exist who would pay her ungodly amounts of money just so they could put on a diaper, shit in it, and have her change it.
...Just throwing that out there.
(I added the "shit in it" part. I'm not sure that that part's true. I've assumed it is.)