Q. 1. What does the Catholic Church mean when it says that "homosexual acts are intrinsically disordered?"
A. 1. Your question relates to the following paragraph in the Catechism of the Catholic Church (C.C.C.):
"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." [CDF, Persona humana 8.] 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." [C.C.C. # 2357]
The first impression of most of those who hear that "homosexual acts are intrinsically disordered," they associate the word "disordered" with the person being dysfunctional, being mentally unbalanced (as a "disordered patient "or a "disordered mind"), being confused, deranged, physically or mentally ill. Each person has their own interpretation depending on their upbringing.
According to the teachings of the Catholic Church, the word "disordered” means that the acts of homosexuality are actions that are not ordered to their proper end or purpose. God created a man and a woman, each being of a different gender so that their sexual acts would serve the purpose of procreation for the bonding of a mother and father who would raise their children who were conceived through their sexual intimacy.
In the Holy Bible, more specifically in the Old Testament, homosexuality is described as an abomination. In the New Testament, St. Paul refers to it as "paraphysin", which means "contrary to nature."
In conclusion, allow me to quote from Msgr. Charles Pope on September 16, 2014, in his article called, "Homosexual Acts Cannot be Approved or Celebrated by the Church – Here’s Why."
"Homosexuals are not being singled out in this matter. As we saw in yesterday’s post, fornication (pre-marital sex) is also set forth by scripture and tradition as a very serious mortal sin (cf Eph 5:5- 7; Gal 5:16-21; Rev 21:5-8; Rev. 22:14-16; Mt. 15:19-20; 1 Cor 6:9-20; Col 3:5-6; 1 Thess 4:1-8; 1 Tim 1:8-11; Heb 13:4). It cannot be approved no matter how widespread its acceptance becomes. One standard of sexual norms applies to all people, whatever their orientation."
Homosexual or not, outside of marriage, all persons are called to a life of chastity.