NARS Holiday 2010 includes Sex Appeal blush ($26). This is a very, very soft light baby peach.

When applied, Sex Appeal provides only the faintest hint of color using a standard blush brush and normal application.
In some ways, NARS Sex Appeal reminds me of a MAC Beauty Powder called Tahitian Sand. Both give the softest peach-toned color, although Tahitian Sand can be built up to a near-blush shade with heavy application. Sex Appeal barely shows on my MAC NC15/Chanel Intensity 1.o (Cameo/Ivoire) skintone. I’m afraid that I will not get very much use out of Sex Appeal–the color hardly shows at all. My personal routine makes me more inclined to use a liquid or shimmery cream highlighter for a more pronounced glow.
Here is Sex Appeal heavily swatched next to a standard peach blush, Shu Uemura’s P Peach 47:

My feeling is that NARS Sex Appeal is very much a “your mileage may vary” blush. For my fair, warm-toned skin, I believe that the color is truly a barely-there blush. Does Sex Appeal work for you? Perhaps you can persuade me that I am wrong about this blush?
