《玉房秘诀》云∶黄帝曰∶何谓五常？素女曰∶玉茎实有五常之道。深居隐处，执节自
守，内怀至德，施行无行无已。夫玉茎意欲施与者，仁也；中有空者，义也。端有节者，礼
也；意欲即起，不欲即止者，信也。临事低仰者，智也。是故真人因五常而节之，仁虽欲施
予，精若不固，义守其空者，明当禁。使无得，多实既禁之道矣。又当施与，故礼为之节矣。
执诚持之，信既着矣。即当知交接之道。故能从五常，身乃寿也。
《玉房秘诀》云∶黄帝曰∶何以知女之快也。素女曰∶有五征五欲，又有十动，以观其
变，而知其故。
夫五征之候，一曰面赤，则徐徐合之；二曰乳坚鼻汗，则徐徐纳之；三曰嗌干咽唾，则
徐徐摇之；四曰阴滑，则徐徐深之；五曰尻传液，徐徐引之。
素女曰∶五欲者，以知其应。一曰意欲得之，则屏息屏气；二曰阴欲得之，则鼻口两张；
三曰精欲烦者，振掉而抱男；四曰心欲满者，则汗流湿衣裳；五曰其快欲之，甚者身直目眠。
素女曰∶十动之效∶一曰两手抱人者，欲体相薄阴相当也；二曰伸云其两髀者，切磨其
上方也；三曰张腹者，欲其浅也；四曰尻动者，快善也；五曰举两脚拘人者，欲其深也；六
曰交其两股者，内痒淫淫也；七曰侧摇者，欲深切左右也；八曰举身迫人，淫乐甚也。九曰
身布纵者，肢体快也；十曰阴液滑者，精已泄也。见其效，以知女之快也。
According to the *Yufang Mijue* (Secrets of the Jade Chamber): The Yellow Emperor asked, "What are the Five Constants?" Su Nu replied, "The penis indeed embodies the principles of the Five Constants." If one dwells in seclusion, maintains self-discipline, harbors supreme virtue within, and does not indulge excessively during sexual intercourse. When the penis desires to give, this is Ren (Benevolence); when it has a hollow center, this is Yi (Righteousness); when it has distinct segments/rhythms, this is Li (Propriety); when it rises as desired and stops as desired, this is Xin (Trustworthiness); when it adjusts its position according to circumstances, this is Zhi (Wisdom). Therefore, the perfected person regulates themselves according to the Five Constants. Although benevolent desire seeks to give, if essence is not firmly retained, one must wisely prohibit emission, just as guarding the hollow space. This prevents leakage, which is the way to preserve abundant essence. Since giving is necessary, Li (Propriety) serves as the regulation. By holding sincerity, Xin (Trustworthiness) is established. At this point, one should understand the method of intercourse. Thus, by following the Five Constants, one can achieve longevity.
According to the *Yufang Mijue*: The Yellow Emperor asked, "How can one know when a woman experiences pleasure?" Su Nu replied, "There are five signs and five desires, as well as ten movements. By observing these changes, one can understand the underlying causes."
The signs of the five indicators are: First, when the face turns red, one should slowly join; Second, when the breasts become firm and sweat appears on the nose, one should slowly insert; Third, when the throat becomes dry and saliva is swallowed, one should slowly rock; Fourth, when the vagina becomes slippery, one should slowly deepen; Fifth, when fluid flows from the buttocks, one should slowly draw back.
Su Nu said: The five desires indicate corresponding responses. First, when the mind desires fulfillment, breath is held and qi is restrained; Second, when the yin organ desires fulfillment, the nostrils and mouth open wide; Third, when essence desires agitation, the body trembles and embraces the man; Fourth, when the heart desires satisfaction, sweat flows and wets the clothes; Fifth, when intense pleasure is sought, the body straightens and eyes close partially.
Su Nu said: The effects of the ten movements are: First, hugging with both hands indicates a desire for bodies to press closely together and yin and yang to correspond; Second, extending and spreading the thighs indicates a desire to grind against the upper area; Third, opening the abdomen indicates a desire for shallow penetration; Fourth, moving the buttocks indicates pleasure and comfort; Fifth, lifting both legs to hook the partner indicates a desire for deep penetration; Sixth, crossing the two thighs indicates internal itching and arousal; Seventh, swaying sideways indicates a desire for deep left-right friction; Eighth, pressing the whole body against the partner indicates intense sexual joy; Ninth, stretching the body loosely indicates physical relaxation and ease; Tenth, slippery vaginal fluid indicates that essence has been ejaculated. Observing these effects allows one to know whether the woman is experiencing pleasure.