The Taoist essay Yang-sheng lun, or "On Nourishing Life," says that in early summer people are full of vigor but should restrain sexual activities to stabilize the ch'i, or vital energy, in the heart.
最重視養生的道家，對於炎炎夏日，還有話要說﹘ ﹘在道家的「養生論」中，認為初夏活動力大，但男女間的「親密關係」要稍加節制，使心氣安定。