《玉房秘诀》云∶冲和子曰∶养阳之家，不可令女窃窥此术，非但阳无益，乃至损病。
所谓利器假人，则攘袂莫拟也。
又云∶彭祖曰∶夫男子欲得大益者，得不知道之女为善。又当御童女，颜色亦当如童女。
女但苦不少年耳。若得十四五以上、十八九以下，还甚益佳也。然高不可过三十，虽未三十
而已产者，为之不能益也。吾先师相传此道者，得三千岁。兼药者可得仙。
又云∶欲行阴阳取气养生之道，不可以一女为之得。得三若九、若十一，多多益善。采
取其精液，上鸿泉，还精、肥肤、悦泽、身轻、目明，气力强盛，能服众敌，老人如二十时。
若年少，势力百倍。
又云∶御女欲一动辄易女。易女可长生若故。还御一女者，女阴气转微，为益亦少也。
又云∶青牛道士曰∶数数易女则益多，一夕易十人以上尤佳。常御一女，女精气转弱，
不能大益人，亦使女瘦 也。
《玉房指要》云∶彭祖曰∶交接之道无复他奇。但当纵容安徐，以和为贵。玩其丹田，
求其口实，深按小摇，以致其气。女子感阳亦有微候，其耳热如饮淳酒，其乳暖起，握之满
手，颈项数动，两脚振扰，淫衍窈窕乍男身，如此之时，小缩而浅之，则阳得气于阴，有损。
又，五脏之液，要在于舌，赤松子所谓玉浆可以绝谷，当交接时多含舌液及唾，使人胃中豁
然如服汤药，消渴立愈，逆气便下，皮肤悦泽，姿如处女。道不远求，但俗人不能识耳。采
女曰∶不逆人情，而可益寿，不亦乐哉。
According to the *Yufang Mijue* (Secrets of the Jade Chamber), Chonghezi stated: Those practicing sexual cultivation must not allow women to secretly observe these techniques. Not only will this bring no benefit to the man, but it may even cause disease and injury.
This is likened to lending a sharp weapon to another; one would be unable to defend oneself when sleeves are rolled up for combat.
It further states: Pengzu said: For men desiring great benefit, it is best to engage with women who do not understand these arts. Furthermore, one should engage with virgins, whose appearance should resemble that of a maiden.
The woman should simply not be too young. If one can obtain a girl aged between fourteen or fifteen and eighteen or nineteen, it is highly beneficial. However, the age should not exceed thirty. Even if under thirty, women who have already given birth cannot provide such benefits. My predecessors who transmitted this Dao claimed to live for three thousand years. Those who combine it with herbal medicine may attain immortality.
It also states: To practice the Dao of Yin-Yang Qi extraction for health preservation, relying on a single woman is insufficient. Obtaining three, nine, or eleven women is better, and the more the merrier. By collecting their essence, guiding it to the "Hongquan" (Great Spring), returning the essence to nourish the skin, enhance luster, lighten the body, clarify the eyes, and strengthen Qi and physical power, one can resist various adversaries. The elderly will appear as they did at twenty. For the young, the effect will be a hundredfold.
It further states: When engaging with women, change partners with each movement. Changing partners promotes longevity or maintains original vitality. If one repeatedly engages with the same woman, her Yin Qi becomes weaker, and the benefits diminish.
It also states: The Green Ox Doctor said: Frequently changing partners yields greater benefits; changing more than ten partners in one night is particularly excellent. Consistently engaging with the same woman causes her essence and Qi to weaken, failing to greatly benefit the man, and also causes the woman to become emaciated.
According to the *Yufang Zhiyao* (Essentials of the Jade Chamber), Pengzu said: The art of intercourse holds no other mysteries. One should merely be indulgent, tolerant, calm, and slow, valuing harmony above all. Stimulate the Dantian, seek oral contact, press deeply with slight oscillation, to induce Qi flow. When a woman responds to Yang Qi, there are subtle signs: her ears turn red as if intoxicated by fine wine, her breasts warm and swell, feeling full in the hand, her neck moves repeatedly, her legs tremble and disturb, and her posture becomes soft and alluring. At this moment, if one slightly retracts and penetrates shallowly, the Yang Qi drawn from Yin will result in loss.
Furthermore, the fluids of the five Zang organs center on the tongue, which is what Chisongzi referred to as "Jade Saliva" capable of sustaining life without grain. During intercourse, one should retain much saliva and tongue fluid, making the stomach feel open and clear, as if taking herbal decoctions. Thirst-quenching diseases will heal instantly, rebellious Qi will descend, the skin will become lustrous, and the demeanor will resemble that of a virgin. The Dao is not far to seek; it is merely that common people fail to recognize it. Cai Nu said: Not going against human nature yet extending lifespan—is this not joyful?