If you read Genesis you will see that God created woman for man. The sexual difference is for the propagation of children. The Church is aware of this.
Jesus did not say, a man must leave his parents and cling to another man and become one with another man,
said, “Have you not read that from the beginning, the creator made them male and female and this is why a man must leave father and mother, and cling to his wife, and the two become one body? They are no longer two, therefore, but one body. So, then, what God has united, man must not divide.” [Matthew 19:4-6]
Right from the beginning, God said in Genesis 2:24 says, “A man will leave his father and mother and be united to his wife, and they will become one flesh.”
The Church cannot go against God, or Jesus.