I do agree with the previous sentiments about the wearer defining the fragrance, and not the other way around. If you feel sexy in it, then others will probably find it sexy on you. However, fiance has a few that he seems to find particularly alluring, so I think of these as my sexiest, come-hither sorts of scents.
Calvin Klein's Euphoria - soooooo smoldery and sexy, too floral to be edible but absolutely delicious none-the-less. Mysterious, sultry and exotic.
L'Instant de Guerlain - this one has such oomph, and is just so overtly feminine and womanly...I feel like a glorious, voluptous goddess when I wear it. Very luscious, opulent and radiant, but honey-sweet so not everyone's cup of tea.
Mystère de Rochas - a deep and smoldery, super-sophisticated femme fatale of a scent. This plush animalic chypre is the opposite of prim, although I don't find it dirty or skanky at all. I always think of clean, warm kitty fur when I smell this...a grown-up she-kitty wearing a touch of chic perfume.
Coco by Chanel - spicy, ultra-lush and velvety sex-pot perfume, darkly opulent, extravagant and dramatic. And drop-dead gorgeous, of course.