I also think those peculiar things about a person's body can make them special. my guy... ex... he had this sort of dent in the middle of his chest. It was apparently genetic and can be much much worse in some people, and was apparently worse when he was a kid. But man I loved that spot when we were together. It was the perfect place to rest my hand.
I don't know that there are too many parts of the body that aren't already sexualized in some way. Collarbones? Shoulder blades? Neck? Come on guys, those are not under appreciated! I've gotta say I like knobby knees, though.