The Catechism:
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,141 tradition has always declared that “homosexual acts are intrinsically disordered.”142 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.
141 Cf. Gen 191-29; Rom 124-27; 1 Cor 6:10; 1 Tim 1:10.
142 CDF, Persona humana 8.
And, from wiki on Persona Humana:
Persona Humana is a document published by the Congregation for the Doctrine of the Faith in 1975. It is a declaration on certain questions concerning sexual ethics.
Persona Humana regards human sexuality as a central element of the person because it gives the person’s life the principle traits that distinguish it. The exaltation of sex in contemporary society occasioned the CDF to deal with sexual ethics so that we can understand with our own intelligence the values innate in our nature. The line of thought of Persona Humana revolves around the observation that “Man has been made by God to participate in His Divine Law with the result that, under the gentle disposition of Divine Providence, he can come to perceive ever increasingly the unchanging truth. Since this Divine Law is accessible to our minds, we cannot make value judgments according to our personal whim in moral matters.” [1]
And Persona Humana:
don’t miss the Biblical references from which it draws. Here are a few of the 47 total:
1. Cf. Second Vatican Ecumenical Council, Constitution on the Church in the Modern World “Gaudium et Spes,” 47 AAS 58 (1966), p. 1067.
2. Cf. Apostolic Constitution “Regimini Ecclesiae Universae,” 29 (Aug 15th, 1967) AAS 89 (1967), p. 1067.
3. “Gaudium et Spes,” 16 AAS 58 (1966), p. 1037.
4. Jn 8:12.
5. Second Vatican Ecumenical Council, Declaration “Dignitatis Humanae,” 3 AAS 58 (1966), p. 931.
6. I Tim 3:15
...
28. Mt 5:28.
29. Cf. Gal 5:19-23; I Cor 6:9-11.
30. I Thess 4:3-8; cf. Col 3:5-7; I Tim 1:10.
31. Eph 5:3-8; cf. 4:18-19.
32. I Cor 6:15, 18-20.
33. Cf. Rom 7:23.
34. Cf. Rom 7:24-25.
35. Cf. Rom 8:2.
36. Rom 6:12.
37. I Jn 5:19.
38. Cf. I Cor 10:13.
39. Eph 6:11.
40. Ct Eph 6:16, 18.
41. Ct I Cor 9:27.
42. Lk 9:23.
43. II Tim 2:11-12.
44. Second Vatican Ecumenical Council decree “Inter Mirifica,” 6 AAS 56 (1964), p. 147.
45. “Gravissimum Educationis,” 1: AAS 58 (1966), p. 730.
Whoops. left out this part:
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.