As the Greeks intended

Romain Mesnil is a French world vice-champion pole vaulter but he has lost his sponsorship deal. He made a video of himself running 'nude' through Paris streets, including the Rue Vieille du Temple, in the middle of the gay neighbourhood, to promote himself and to drum up some fresh sponsorship cash.
If he doesn't get any sponsorship from gay business, then there is no hope or justice in this world.
He has put up a few items on ebay France for you to sponsor - including lunch or dinner with him. I'd rather do breakfast after the night before, if you get my drift.

Mind you, just imagine the ratings if the Olympics were televised as they were performed by the classical Greeks. It'd pay for the lot of them.
In the meantime, there are some options for nude athletes.