Many men just attack a woman's nipples, twisting them as if they were magic sex dials. While some women may enjoy that (usually after a bit more foreplay), the majority prefer a softer approach. Drive her crazy with soft kisses everywhere BUT her nipples.

Then when they are nice and hard and erect, flick them gently with your tongue and suck them lightly for just a few seconds. Leaver her begging for more! come back and apply a little soft action to the nipples every so often and you won't run the risk of over-stimulating them. And, of course, if she's telling you to pinch or bite, go for it!