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From the cathechism: 2331 "God is love and in himself he lives a mystery of personal loving communion. Creating the human race in his own image . . .. God inscribed in the humanity of man and woman the vocation, and thus the capacity and responsibility, of love and communion."115
"God created man in his own image . . . male and female he created them";116 He blessed them and said, "Be fruitful and multiply";117 "When God created man, he made him in the likeness of God. Male and female he created them, and he blessed them and named them Man when they were created."118
2332 Sexuality affects all aspects of the human person in the unity of his body and soul. It especially concerns affectivity, the capacity to love and to procreate, and in a more general way the aptitude for forming bonds of communion with others.
The Catholic teaching is that the marriage act is both unitive and procreative. It serves two functions. Human being arte not animals that go into rut at the drop of a hat, nor are they meant to be strictly breeders. 2333 Everyone, man and woman, should acknowledge and accept his sexual identity. Physical, moral, and spiritual difference and complementarity are oriented toward the goods of marriage and the flourishing of family life. The harmony of the couple and of society depends in part on the way in which the complementarity, needs, and mutual support between the sexes are lived out.