Taoist Techniques and The Taoist 9 in 1 Technique
The Ancient Taoist had developed an extensive array of thrusting techniques for intercourse. They believed that the man should vary his thrusting speed and thrusting depth and thrusting angle in order to fully stimulate his lover and himself during a prolonged coition (Taoist also believed in prolong acts of intercourse and are famous for the term 1000 loving thrusts.)
They also gave names to the different levels of depths in the vagina.
They are as follows:

1. Lute String, the depth of one inch inside.
2. Water chestnut Teeth, the depth of two inches.
3. Little Stream, the depth of three inches.
4. Black Pearl, the depth of four inches.
5. Valley’s Proper, the depth of five inches.
6. Deep Chamber, the depth of six inches.
7. Inner Door, the depth of seven inches.
8. North Pole, the depth of eight inches.