Every human being is called to receive a gift of divine sonship, to become a child of God by grace. However, to receive this gift, we must reject sin, including homosexual behavior—that is, acts intended to arouse or stimulate a sexual response regarding a person of the same sex. The Catholic Church teaches that such acts are always violations of divine and natural law.
Homosexual desires, however, are not in themselves sinful. People are subject to a wide variety of sinful desires over which they have little direct control, but these do not become sinful until a person acts upon them, either by acting out the desire or by encouraging the desire and deliberately engaging in fantasies about acting it out. People tempted by homosexual desires, like people tempted by improper heterosexual desires, are not sinning until they act upon those desires in some manner.
Read it all at Catholic Answers
http://www.catholic.com/tracts/homosexuality
Noting that Matthew 23:13 shows that Jesus reprimanded the Pharisees for being a stumbling block to people seeking God, this is why I have trouble with Cardinal Dolan’s “open arms” stance on homosexuality.
The “blind” are following the “blind.”