Typically, these are places that don't get touched a whole lot. These are many times spots people are ticklish in if that helps you gauge where to kiss and stuff.
Ear Lobes (Sucked on or nibbled)
Collar Bone (Kissing)
Behind the Knee
Inside of the Elbow
Save time and money. Stick with experimenting.
There are common spots on every woman that are more sensitive, but remember, every woman is different, physically. The best way to find out what spots turn her on is to touch her and then PAY FUCKING ATTENTION to her reactions.
There is no magic spot. There is no magic technique. It's fundamentals, then read and react.
Plus, toes. Seriously. Toes.
"War is not the answer. Love is."