Youcat commented through CCC - Question n. 64 Part II.

YOUCAT Question n. 64 Part II. - Why did God create man male and female?

(Youcat answer - repeated) God, who is love and the archetype of community, created man male and female so that together they might be an image of his nature.       

A deepening through CCC

(CCC 371) God created man and woman together and willed each for the other. The Word of God gives us to understand this through various features of the sacred text. "It is not good that the man should be alone. I will make him a helper fit for him" (Gen 2:18). None of the animals can be man's partner (Gen 2:19-20). The woman God "fashions" from the man's rib and brings to him elicits on the man's part a cry of wonder, an exclamation of love and communion: "This at last is bone of my bones and flesh of my flesh"  (Gen 2:23). Man discovers woman as another "I", sharing the same humanity.

Reflecting and meditating 

(Youcat comment) God made man in such a way that he is male or female and longs for fulfillment and completion in an encounter with the opposite sex. Men and women have absolutely the same dignity, but in the creative development of their masculinity and femininity they give expression to different aspects of God’s perfection. God is not male or female, but he has shown himself to be both fatherly (Lk 6:36) and motherly (Is 66:13). In the love of man and woman, especially in the community of marriage, in which man and woman become “one flesh” (Gen 2:24), people are privileged to sense something of the happiness of the union with God in which every man finds his ultimate wholeness. Just as God’s love is faithful, so also their love seeks to be faithful; and it is creative, as God is, because from marriage new life comes forth.  

(CCC Comment)

(CCC 372) Man and woman were made "for each other" - not that God left them half-made and incomplete: he created them to be a communion of persons, in which each can be "helpmate" to the other, for they are equal as persons ("bone of my bones…") and complementary as masculine and feminine. In marriage God unites them in such a way that, by forming "one flesh" (Gen 2:24), they can transmit human life: "Be fruitful and multiply, and fill the earth" (Gen 1:28). By transmitting human life to their descendants, man and woman as spouses and parents cooperate in a unique way in the Creator's work (Cf. GS 50 § 1).    

(This question: Why did God create man male and female? is continued)