《玉房秘诀》云∶采女问曰∶交接以泻精为乐，今闭而不泻，将何以为乐乎？彭祖答曰∶
夫精出则身体怠倦，耳苦嘈嘈，目苦欲眠，喉咽干枯，骨节懈堕，虽复暂快，终于不乐也。
若乃动不泻，气力有余，身体能便，耳目聪明，虽自抑静，意爱更重，恒若不足，何以不乐
耶。
又云∶黄帝曰∶愿闻动而不施，其效何如？素女曰∶一动不泻，则气力强；再动不泻，
耳目聪明；三动不泻，众病消亡；四动不泻，五神咸安；五动不泻，血脉充长；六动不泻，
腰背坚强；七动不泻，尻股益力；八动不泻，身体生光；九动不泻，寿命未失；十动不泻，
通于神明。
《玉房指要》云∶能一日数十交而不失精者，诸病皆愈，年寿日益，又数数易女，则益
多，一夕易十人以上尤佳。
又云∶《仙经》曰∶还精补脑之道，交接精大动欲出者，急以左手中央两指却抑阴囊后
大孔前，壮事抑之，长吐气，并喙齿数十过，勿闭气也。便施其精，精亦不得出，但从玉茎
复还上，入脑中也。此法仙人吕相授，皆饮血为盟，不得妄传，身受其殃。
又云∶若欲御女取益而精大动者，疾仰头张目，左右上下视，缩下部，闭气，精自止。
勿妄传。人能一月再施、一岁二十四施，皆得寿一二百岁，有颜色无病 。
《千金方》云∶昔贞观初，有一野老可七十余，诣余曰∶近数十日来，阳道益盛，思与
家姥昼夜春事皆成，未知垂老有此，为益为恶耶？余答之曰∶是大不祥也。子独不闻膏火乎？
夫膏火之将竭也，必先暗而后明，明止即灭也，今足下年迫桑榆，久当用精，兹忽春情猛发，
岂非反常耶。窃为足下忧之。子（其）勉欤，后四旬发病而猝。此其不慎之效也。所以善摄
生者，凡觉阳道盛，必谨而抑之，不可纵心竭意以自贼也。若一度制得不泄，则是一度大增
油。若不能制得，纵情施泻，则是膏火将灭，更去其油，不可不深以自防也。
《玉房秘诀》记载：采女问道：“性交以射精为乐，现在闭精不射，那还有什么乐趣呢？”彭祖回答说：
精气射出后身体就会疲倦乏力，耳朵里感到嘈杂轰鸣，眼睛困倦想睡觉，咽喉干燥，关节松懈无力，虽然暂时痛快，但最终并不快乐。
如果动作激烈但不射精，气力就会充沛，身体轻便，耳目灵敏，即使自我克制保持安静，情意爱意反而更重，常常觉得精力不足，这怎么能不快乐呢。
又说：黄帝说：“我想了解动而不施精，效果如何？”素女说：“一次动而不射，则气力增强；两次动而不射，耳目聪明；三次动而不射，各种疾病消除；四次动而不射，五脏之神皆安宁；五次动而不射，血脉充盈生长；六次动而不射，腰背坚强；七次动而不射，尾闾和大腿力量增加；八次动而不射，身体容光焕发；九次动而不射，寿命得以保全；十次动而不射，通于神明。”
《玉房指要》记载：能够一天进行几十次性交而不泄精的人，各种疾病都会痊愈，年寿日益增长，而且频繁更换女性伴侣，益处更多，一晚更换十人以上尤其好。
又说：《仙经》说：“还精补脑的方法，在性交时精气大动将要射出时，立即用左手中间两指向后按压阴囊后方、肛门前方，剧烈运动时用力按压，长长地吐气，并叩齿数十次，不要憋气。此时即使想要射精，精液也无法排出，而是从阴茎回流向上，进入脑中。此法由仙人吕相传授，都饮血为盟，不得妄自传授，否则会受到灾殃。”
又说：如果想要御女取益而精气大动时，迅速仰头睁眼，向左右上下看，收缩下部（会阴），憋住气，精液自然停止外泄。不要妄自传授。人如果能一个月两次施精、一年二十四次施精，都能活到一二百岁，面色红润无病。
《千金方》记载：过去贞观初年，有一位七十多岁的乡下老人，来找我说道：“最近几十天来，性功能越发旺盛，想着和老伴昼夜行房都能成功，不知道年老体衰还有这种情况，是有益还是有害呢？”我回答他说：“这是非常不吉祥的。您难道没听说过灯油吗？灯油即将耗尽时，火焰必定先变暗然后突然变亮，光亮之后随即熄灭。现在您年纪已大，本该节制用精，如今春情猛烈爆发，难道不是反常吗？我私下为您担忧。请您务必谨慎吧！”后来四十天发病猝死。这就是不慎重的后果。所以善于养生的人，凡是觉得性功能亢盛，必须谨慎抑制它，不可放纵心意竭尽精力来自我残害。如果一次能控制住不射精，就等于增加了一次大量的“油”。如果不能控制，放纵情欲射精，就像是灯油将灭，又去掉了油，不可以不深深防备啊。
*The Yufang Mijue* records: Cai Nu asked, "Intercourse brings pleasure through ejaculation. Now, if we close and do not ejaculate, what pleasure is there?" Peng Zu answered, "When essence is discharged, the body becomes weary and fatigued; the ears suffer from buzzing noise; the eyes are heavy with sleepiness; the throat and pharynx become dry; the joints become loose and weak. Although there is momentary satisfaction, ultimately there is no joy.
If one engages in movement without ejaculation, qi and strength remain abundant; the body feels agile; the ears and eyes become clear and sharp. Even while self-restraining and remaining quiet, affection and love deepen, and one constantly feels a sense of insufficiency (of energy to be cultivated). How can this not be joyful?
It also states: Huang Di said, 'I wish to hear about the effects of moving without emitting.' Su Nu said, 'One movement without emission strengthens qi and power; two movements without emission make the ears and eyes acute; three movements without emission cause various diseases to vanish; four movements without emission ensure the peace of the five spirits; five movements without emission fill and lengthen the blood vessels; six movements without emission make the waist and back strong; seven movements without emission increase the strength of the buttocks and thighs; eight movements without emission make the body radiant; nine movements without emission preserve lifespan; ten movements without emission connect one to divine intelligence.'
*The Yufang Zhiyao* records: One who can engage in intercourse dozens of times a day without losing essence will have all diseases cured, and lifespan will increase daily. Furthermore, frequently changing female partners increases the benefit even more; changing more than ten women in one night is particularly excellent.
It also states: *The Xianjing* (Classic of Immortals) says: "The method of returning essence to nourish the brain: when essence surges greatly during intercourse and is about to exit, immediately use the middle two fingers of the left hand to press backward on the area behind the scrotum and in front of the anus. During vigorous activity, press firmly. Exhale slowly and deeply, and clench the teeth dozens of times. Do not hold the breath. Even if one attempts to emit, the essence cannot exit but instead returns upward from the penis into the brain. This method was transmitted by the immortal Lu Xiang, sealed with blood oaths, and must not be passed on recklessly, or one will suffer disaster."
It also states: If one wishes to practice sexual yoga for benefit and essence surges greatly, quickly look up with eyes wide open, gaze left, right, up, and down, contract the lower region (perineum), hold the breath, and the essence will naturally stop. Do not pass this on recklessly. A person who emits essence twice a month and twenty-four times a year can live to 120 years old, with a healthy complexion and free from disease.
*Qianjin Fang* (Essential Prescriptions Worth a Thousand Gold) records: In the early Zhen Guan era, an elderly villager over seventy years old came to me and said, "For the past few dozen days, my yang function has become increasingly robust. I desire to engage in sexual activities with my wife day and night, and it succeeds. I do not know if having this condition in old age is beneficial or harmful." I replied to him, "This is highly inauspicious. Have you not heard of lamp oil? When lamp oil is about to run out, the flame first dims and then suddenly brightens; after the brightness, it extinguishes. Now that you are near the end of your life (mulberry and elm), you should long have been conserving essence. For spring passion to erupt fiercely now, is this not abnormal? I privately worry for you. You must be cautious!" Forty days later, he fell ill and died suddenly. This was the result of carelessness. Therefore, those who are good at preserving health, whenever they feel excessive yang vigor, must carefully restrain it and must not indulge their desires to exhaust their energy and harm themselves. If one can control oneself once and avoid emission, it is like adding a large amount of oil. If one cannot control oneself and indulges in emission, it is like the lamp oil being about to go out and removing more oil. One must guard against this deeply.