I think it is a form of prostitution: you are selling yourself.
I wonder if the auction winner (or customer) has to provide documentation to prove that he is healthy and disease free. Has she done a back ground check on him? Is he, for example, married with a family? Or does he have a criminal record or a shady background? What kind of man bids for sex like this anyway?
It sounds like the movie with Liam Neeson, "Taken", only the woman is volunteering to be auctioned off.
I wonder how you would even start having sex in this sort of situation and how long will the sex last? I'm sure the man is going to want to get his money's worth or is there a time limit attached to the event? And where are they going to do it, at his place? Who will protect her if something goes wrong or will she bring a body guard along?