Thrusting patterns are the subject of much discussion in the ancient texts. Men tend to think that deeper is better because they see her shiver and moan when they thrust hard. But it's not that simple. As in art so in life. Variety is the spice. In practice, it is enough to keep in mind three things: Tease her clitoris with your lingam before you enter. When you enter, stay just inside, just the head of the lingam or a little more. The nature-oriented Taoists likened this strategy to a turtle that sticks his head just a little out of his shell -Turtle Resting. Once you begin to move, don't just vary by going side to side or in circles. Try three or six or nine shallow, followed by one deep. When you do go all the way, thrusting "to the North Star" as the Taoists would say, tighten the anal muscles. It will make the head of your lingam swell. However you do it, this pattern will set up a tough and tender rhythm of shallow, shallow, shallow deep., shallow , shallow, shallow deep
She will be looking forward to your deep move and may greet you with a vigorous thrust from her own pelvis.

From the Ancient Secrets of Sexual Ecstasy Video:
http://tantra.com/tantra2/10-110.html