Halakhah for Yevamot 125:17

The most significant human reciprocal completion is the one between male and female, for with it human beings can reveal the divine image within them and achieve perfection. Not only concerning humanity, but in all of creation, from the sublime realms down to this earth, there is a division into male and female; neither sex can exist and endure independently, without the completion of the other. This fundamental principle is clarified at length in the wisdom of the Kabbala. That is what R. Elazar meant when he said: “Every man without a woman is not a [complete] person, as it is written: ‘Male and female He created them, and He blessed them and called them man’ (Bereishit 5:2)” (Yevamot 63a). Likewise, the Sages teach us: “Every man without a woman is inundated by unhappiness, without blessing, without goodness…without Torah, without fortification” (Yevamot 62b).