男女和悦，彼此情动，而后行之，则阳施阴受而胚胎成，是以有子。若男情已至而女心未动，则玉体才交琼
浆先吐，阳精虽施而阴不受矣。若女情已至而男志或异，则桃浪徒翻玉露未滴，阴血虽开而阳无入矣。阴阳乖
离成天地不交之否，如之何能生万物哉。
天地生物必有 之时，万物化生必有乐育之候。猫犬至微将受孕也，其雌必狂呼而奔跳，以 乐育之
气触之而不能自止耳，此天地之节候生化之真机也。妇人于经尽之候，必有一日子宫内挺出莲花蕊子，气蒸而
热，神昏而闷，有欲交接不可忍之状，此受精结胎之候也。于此时逆而取之则成丹，顺而取之则成胎。但妇人
每含羞不肯言耳，男子须预告之，令其自言，则一举即中矣。
玉湖须浅泛，浅则女美，重载却成忧，深则女伤。阴血先参聚，女血先来；阳精向后流，男精后至，红花
含玉露，血裹精则生男，平步到瀛洲，直上成胎。
男女未交之时，男有三至者∶谓阳道奋昂而振者，肝气
至也；壮大而热者，心气至也；坚劲而久者，肾气至也。三至俱足，女心之所悦也。若痿而不举，肝气未至也，
肝气未至而强合，则伤其筋，其精流滴而不射矣。壮而不热者，心气未至也，心气未至而强合，则伤其血，
其精清冷而不暖矣。坚而不久者，肾气未至也，肾气未至而强合，则伤其骨，其精不出，虽出亦少矣。求嗣者，
所贵寡欲清心，以养肝心肾之气也。
男女之间情意和谐，彼此情欲发动，然后进行房事，则阳施阴受而胚胎形成，因此能够生育子女。如果男方情欲已至而女方心意未动，那么身体刚接触，女方的津液（此处指阴道分泌物）就已流出，虽然男方射出了精液，但女方并未接受（受孕）。如果女方情欲已至而男方意志有异（兴致不高），那么就像桃浪徒然翻涌却无玉露滴落，女方的阴血虽已开放（指生理准备就绪），但男方的阳气无法进入。这就如同天地不交而形成的“否”卦之象，怎么能化生万物呢？
天地化生万物必有其时机，万物孕育成长必有其快乐育化的时刻。猫狗等微小动物在将要受孕时，雌性必定会狂叫奔跑跳跃，这是因为受到乐育之气触动而不能自止的缘故，这是天地节候生化真实的机理。妇女在月经结束的时候，必有一天子宫内会挺出莲花蕊子般的结构，气息蒸腾发热，精神昏沉闷乱，有想要交接不可忍耐的状态，这是受精结胎的征兆。在这个时候逆着规律行事则可能成丹（道家修炼术语，此处指非正常受孕或病理状态），顺着规律行事则能成胎。只是妇女往往含羞不肯说罢了，男子必须预先告知并引导，让她自己说出来，那么一次就能成功受孕。
玉湖（比喻女性阴道）应当浅泛，浅则女子美好，重载（深插）却成为忧患，深了则女子受伤。阴血先参聚，即女方的血液（分泌物）先来；阳精向后流，即男方的精液后至。红花含着玉露，血液包裹精液则生男孩；平步走到瀛洲（仙境，比喻顺利），直上而成胎。
男女尚未交合之时，男方有三至的情况：所谓阳道振奋昂扬而振动，是肝气至的表现；阴茎壮大而发热，是心气至的表现；坚硬强劲且持久，是肾气至的表现。三至都具备，是女方所喜悦的。如果出现痿软而不能勃起，是肝气未至，肝气未至而强行交合，则会损伤筋脉，其精液只会流淌滴出而不能喷射。如果阴茎壮实但不发热，是心气未至，心气未至而强行交合，则会损伤血液，其精液清冷而不温暖。如果坚硬但不能持久，是肾气未至，肾气未至而强行交合，则会损伤骨骼，其精液不出，即使射出也很少。求子的夫妇，贵在减少欲望、清静心神，以涵养肝、心、肾的气机。
When men and women are in harmony, and mutual desire is aroused, only then should intercourse take place. In this way, Yang exerts and Yin receives, leading to the formation of the embryo, thus enabling conception. If the man's desire has reached its peak but the woman's mind is not yet moved, their bodies may just touch, yet the woman's fluids (vaginal secretions) will flow out first. Although the man ejaculates, the woman does not receive it (conception fails). If the woman's desire has reached its peak but the man's will is different (lack of interest), it is like peach waves churning in vain without jade dew dropping; although the woman's Yin blood is open (physiologically prepared), the man's Yang cannot enter. This is akin to the "Pi" hexagram where Heaven and Earth do not interact; how can myriad things be generated?
Heaven and Earth must have specific times for generating life, and the transformation of all things must have moments of joyful nurturing. Even tiny animals like cats and dogs, when about to conceive, the female will cry wildly and run and jump, unable to stop herself due to being touched by the Qi of joyful nurturing. This is the true mechanism of biological generation according to the seasons of Heaven and Earth. When a woman's menstruation ends, there is a day when a structure resembling the stamen of a lotus flower protrudes from the uterus. Her breath feels steaming and hot, her spirit is dull and stifled, and she has an unbearable urge for intercourse. This is the sign of fertilization and conception. Acting against this timing may lead to forming "Dan" (a Daoist alchemical term, here implying abnormal conception or pathology), while following it leads to conception. However, women often feel shy and refuse to speak of it. Men must guide them beforehand, allowing them to express it themselves, so that success can be achieved in one attempt.
The Jade Lake (metaphor for the female vagina) should be shallowly traversed; shallowness benefits the woman, while heavy burdening (deep penetration) becomes a worry, causing injury if too deep. Yin blood gathers first, meaning the woman's blood (secretions) come first; Yang essence flows later, meaning the man's semen arrives subsequently. Red flowers holding jade dew: when blood wraps around semen, a male child is born. Walking flatly to Yingzhou (a mythical immortal island, symbolizing smooth progress): rising straight up leads to conception.
Before men and women engage in intercourse, the man experiences three arrivals (San Zhi): The penis becoming vigorous, erect, and trembling indicates the arrival of Liver Qi; becoming enlarged and hot indicates the arrival of Heart Qi; becoming firm, strong, and lasting indicates the arrival of Kidney Qi. When all three are present, it pleases the woman. If impotence occurs without erection, it means Liver Qi has not arrived. Forcing intercourse before Liver Qi arrives damages the sinews, resulting in semen dripping rather than ejecting. If the penis is large but not hot, it means Heart Qi has not arrived. Forcing intercourse before Heart Qi arrives damages the blood, resulting in cold and clear semen. If it is firm but not lasting, it means Kidney Qi has not arrived. Forcing intercourse before Kidney Qi arrives damages the bones, resulting in no ejaculation, or very little if it does occur. Those seeking offspring should value reducing desires and clearing the mind to nourish the Qi of the Liver, Heart, and Kidneys.