thanks Nykkii...I don't think we are that far off...I like the way you explained...very clear.
Since sensuality has the base word of "senses", it makes "sense" that all senses are used. I also think sensuality is more subtle, because it is about using the senses. Knowing your significant other, what subtle vibes you can send to attract, arouse, and please. An unexpected phone call to conjecture an image or thought...that only the two people understand...the subtle touch, light touch of the hand, touch of the hair, etc.
Sexy is being more open, like you said, to arouse either mentally or physically.
Sexy and sensual are key pieces of any relationship...the variety keeps it alive.