Concerning the sequence of coitus and life, Chu Cheng pointed out that the production of fetus is the result of coagulation of paternal essence and maternal blood.

• 对于男女媾精而产生生命的具体过程,褚澄指出:胎儿的生成在于父精母血的凝聚,应做到男子惜精,女子益血,方能通过交合而达到孕育的目的。