One of the most basic things that even children know about advertising is that, as clichÃ© as it is, sex sells. It really should come as no surprise then that that is the concept people came up with when entering a user-generated ad competition. It didn't matter that the campaign was meant to be for Voyages-sncf.com, a French railway company; naughty sells all, even public transit!
Check out some more assvertising, these ones created by the pros:
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Pop-Up Cracker Restaurants
Celebrity Artist Documentaries
Swedish Cider Lifestyle Pop-Ups
Pizza Bath Bombs