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Nor is there any evidence that implanting sexual images in cake icing increases sales.1
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1 For reviews of research on subliminal influence, see Moore (1992); Pratkanis (1992); Theus (1994). A review by Dijksterrhuiis, Aarts, and Smith (2001) is more sanguine about the possibility of subliminal influence, but acknowledges that even effects found under controlled laboratory conditions tend to be small in magnitude.