In Brief CCC 383
© Libreria Editrice Vaticana Source: vatican.va
"God did not create man a solitary being. From the beginning, "male and female he created them" (Gen 1:27). This partnership of man and woman constitutes the first form of communion between persons" (GS 12 # 4).
Read the full chapter 1. I Believe in God the Father ¶198–421