“In order to harmonize fully with a woman who is going through the nine stages of arousal, the man will naturally pass different phases of arousal before entering her. The Yellow Emperor is said to have asked: “If I wish to make love but fail to gain erection, is it wise to force intercourse?”
The Mysterious Lady replied, “No, it is not wise. The Jade Stalk (penis) should first pass the Four Attainments before intercourse will be proper.”
Naturally the Emperor asked, “What are the Four Attainments?”
“If the Jade Stalk is not able to erect”, she replied, “the yin and yang energy is not in harmony.
Firmness is the first attainment. If the Jade Stalk erects, but is not swollen, the chi is insufficient in the blood.
Swelling is the second attainment.
Hardness is the third attainment. If the man’s Jade Stalk is swollen, but not hard, his chi has not penetrated to his bones.
Heat is the fourth attainment.“Finally, if the Jade Stalk is hard but not hot, the vital energy has not reached the man’s spirit.