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Catholics believe that men and women are born as men and women and that they cannot “transition” to another sex. The Church teaches that someone who is born a woman is a woman, no matter what hormone therapies or surgeries have been done on this person in an attempt to become male. For that reason, the Church considers a romantic relationship between a woman and a “trans man” to be a romantic relationship between two women and thus a form of homosexual activity. The Church states that homosexual activity is a grave sin:
Homosexuality refers to relations between men or between women who experience an exclusive or predominant sexual attraction toward persons of the same sex. It has taken a great variety of forms through the centuries and in different cultures. Its psychological genesis remains largely unexplained. Basing itself on sacred Scripture, which presents homosexual acts as acts of grave depravity, tradition has always declared that “homosexual acts are intrinsically disordered.” They are 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. Under no circumstances can they be approved (CCC 2357).