Homosexuality is treated in Roman Catholic Church teaching under two forms: homosexual orientation is considered an "
objective disorder" because Catholicism views it as being "
ordered toward an intrinsic moral evil", but not sinful unless acted upon.
Homosexual sexual activity, by contrast, is viewed as a "[B]moral disorder" and "homosexual acts" as "
contrary to the natural law.
They close the sexual act to the gift of life. They do not proceed from a genuine affective and sexual complementarity."
The Catholic Church teaches that marriage can only be between a man and a woman
https://en.wikipedia.org/wiki/Homose...an_Catholicism