"God created man in his own image, in the image of God he created him, male and female he created them." Man occupies a unique place in creation: (I) he is "in the image of God"; (II) in his own nature he unites the spiritual and material worlds; (III) he is created "male and female"; (IV) God established him in his friendship.
Source: Catechism of the Catholic Church (Vatican.va)