One man's disgusting is another man's turn on. While a lot of people are outraged I don't have a problem with anything as long as it is taking place behind closed doors and nobody is being forced to join in.

Always struck me as a rather sensible way to make money. Buy a pack of cheap knickers, wear them then sell them for enough to buy more new knickers and probably a fair bit more. A nice new pair every day and think of how you are saving the enviroment by not using all that water and soap powder to wash your undies.