You guys crack me up. Sexually, it's the G spot. (If you don't know where THAT is, do some research...) However, some women don't respond to that as well as we would like. (BTW: The man's G spot is 1-2 inches inside the poop chute... Think about THAT before you ask her to hit ur g spot. lol)
Non-intercourse spots: Gently pulling the hair on the back of the head/neck, inside wrists, inside elbows, behind the ears, behind the knees, between the breasts (<---that one's magic when it's your tongue doing the stimulation), where the butt cheeks meet the leg.
Some women are seriously turned by foot massages or washing too. Offer a foot massage and watch the response.
But these are all mechanical things. #1 way to guarantee you get some? PAY ATTENTION TO WHAT SHE SAYS!! Make eye contact, listen to her, call her once a day. Don't kowtow to her, don't stalk her, just be there and show her that when you're with her, nobody else exists.