Funny that you should post this, as I was just checking into which mobile terms were getting the highest numbers in Google. On a per month, global basis:

450,000 mobile porn
368,000 mobileporn (no space)
246,000 mobile videos
110,000 mobile 3gp videos
90,500 mobile video download
90,500 mobile x
605,000 mobile clips
49,500 cell phone videos

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Snagging some of those on page one would sure be a boost to the traffic count!