From the Catechism of the Catholic Church:
Chastity and homosexuality
2357 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.
2358 The number of men and women who have deep-seated homosexual tendencies is not negligible. This inclination, which is objectively disordered, constitutes for most of them a trial. They must be accepted with respect, compassion, and sensitivity. Every sign of unjust discrimination in their regard should be avoided. These persons are called to fulfill God's will in their lives and, if they are Christians, to unite to the sacrifice of the Lord's Cross the difficulties they may encounter from their condition.
2359 Homosexual persons are called to chastity. By the virtues of self-mastery that teach them inner freedom, at times by the support of disinterested friendship, by prayer and sacramental grace, they can and should gradually and resolutely approach Christian perfection.
From Pope Francis:
The pope then recalled his comments in July, when he told the media aboard a flight to Rome, "Who am I to judge" gay people?
"By saying this, I said what the catechism says."
The catechism, the Catholic Church's book of official doctrine, condemns homosexual acts, but says gays and lesbians "must be accepted with respect, compassion, and sensitivity."
"Religion has the right to express its opinion in the service of the people, but God in creation has set us free: it is not possible to interfere spiritually in the life of a person."
Francis said that someone once asked him if he "approved" of homosexuality.
"I replied with another question," he said. "`Tell me, when God looks at a gay person, does he endorse the existence of this person with love, or reject and condemn this person?’ We must always consider the person. Here we enter into the mystery of the human being."
It's official. The Pope is Catholic.
