I'm not sure if this is a new trend, but lots of challenges over the past month or two have had a "keep it clean" requirement in the description. Pick one of those challenges and enter the dirty version of your work here. Mwahahahaha! (Seriously though, I think there's value in thought-out dirty writing, whether it be sexy, gory, or downright objectionable. Why exclude something you're uncomfortable with when you could expand your repertoire as a reader?)