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The *Dongxuanzi* states: When engaging in sexual intercourse for the first time, one should sit first and then lie down, with the woman on the left and the man on the right. After lying still, let the woman lie supine facing upward, extending her feet and arms. The man lies upon her, kneeling between her thighs, and presses his yang tip (penis) against the jade gate (vaginal opening), standing erect like a fallen pine tree before a deep valley cave. Further rubbing and tightening occurs, with sounds made from the mouth and tongue sucking or licking. One may look up to admire the woman's jade face or look down at the golden ditch (female genitalia), stroking and patting the area between the abdomen and breasts, and massaging the sides of the jade terrace (clitoris or vulvar mound). Thus, the man's passion arises, and the woman's mind becomes entranced. Then, using the yang tip to attack horizontally and vertically, thrusting downward into the jade texture (internal vaginal walls) or upward against the golden ditch, striking beside the biyong (area near the urethral/vaginal opening), and resting to the right of the jade terrace (above describes external play, not yet internal intercourse). The woman should produce abundant fluids, soaking the daniel cavity (deep uterus or vagina). Then insert the yang tip into the uterus, ejaculating quickly so that fluids flow together, irrigating upward to the shentian (chest or epigastrium) and downward to the yougu (deep vagina). Through rhythmic thrusting and friction, the woman may feel as if seeking life or death, begging for existence. Wipe dry with a silk cloth, then insert the penis deeply into the daniel cavity, reaching the yangtai (deep vagina or cervix).

If there is obstruction like a large stone blocking a deep stream, employ the method of "nine shallow and one deep" thrusts. Thus, positioning the pillar longitudinally or transversely, pulling sideways or extracting laterally, alternating between slow and fast, deep and shallow. After twenty-one breaths, observe the qi entering and exiting; when the woman feels pleasure, the man should thrust rapidly and vigorously, lifting high, waiting for the woman's body to move, adjusting to her rhythm. Attack the gu shi (sensitive internal areas) with the yang tip, guiding it into the uterus, grinding left and right, without needing tedious, fine withdrawal and insertion. When the woman's fluids overflow, the man must withdraw; do not remain stagnant ("die"), but return alive ("live"). If ejaculation occurs without vitality, it greatly harms the man; caution is essential.

The *Su Nv Jing* states: The Yellow Emperor asked: Is there a method for yin and yang union? Su Nu replied: When practicing intercourse with a woman, first let her release her hands and settle her body, bending both legs. The man positions himself between them, holding her mouth, sucking her tongue, stroking and manipulating his penis, striking the east and west sides of her gate (vaginal opening). After about the time it takes to eat a meal, slowly insert it. If the penis is large, insert one and a half cun; if small, insert one cun. Do not shake it. Withdraw slowly and reinsert; this can eliminate hundred diseases. Do not allow leakage from the four sides. When the penis enters the vagina, heat naturally arises. Urgently, the woman's body should sway automatically, harmonizing with the man, after which deeper penetration is appropriate. Hundred diseases of both man and woman are eliminated. Shallowly penetrating the qin xian (metaphor for vaginal wall) to three and a half cun requires keeping the mouth closed. Perform thrusting one, two, three... up to nine times. Penetrate deeply to the side of kunshi (metaphor for hard tissue or depth), moving back and forth. Breathe in through the mouth while facing the woman's mouth. Complete the dao of ninety-nine cycles, then proceed thus.