just find time to relax and have a good fiddle down below
HAHA! It's true, though. Knowing your own body well can help you teach someone else how to touch you.
Remember that every woman is different. Some women don't ever have orgasms during sex, but hopefully you'll find a way to make it happen. I have read that it has a lot to do with the position of the clitoris in relation to your vaginal opening. Sometimes, there isn't enough stimulation from sex. And the G-spot... it DOES exist, but it's in a different place for some women. A friend of mine had an inverted uterus (it was tilted backward instead of forward), so her G-spot could be reached better when she had sex "doggie style". Keep trying new positions, and if you run out of ideas, peruse a copy of the Kama Sutra. Sometimes, it's a simple as putting a pillow under your butt while having sex missionary (regular, man-on-top) style. This raises you pelvis and tilts it a bit, sometimes making it easier to hit the G-spot.
Tell Scott that there are some women that can't have orgasm at all during intercourse, and many more that have a really hard time doing so. It isn't necessarily his fault, and women get a great deal of pleasure from sex even without an orgasm. Try different positions, have him give you oral, prolong the foreplay, teach him how to use his hands, relax, and don't give up. Have fun with your "assignment"!