Check out this scripture annalex. Homosexuality IS a sin, whether you act on it or not. Even thinking about it is a sin in God's eyes.
1Cor. 6: 9 Do you not know that wrongdoers will not inherit the kingdom of God? Do not be deceived! Fornicators, idolaters, adulterers, male prostitutes, sodomites (homosexuals). 10 Thieves, the greedy, drunkards, revilers, robbers--none of these will inherit the Kingdom of God. 11 And this is what some of you used to be. But you were washed, you were sanctified, you were justified in the name of the Lord jesus Christ and in the Spirit of our God.
Repentance, turning away from sin and asking the Lord Jesus Christ to come into your life to take over Lordship of it, will wash away a person's sins. Has nothing to do with works, although works are necessary after we've been saved.
The scripture you offered does not say so. St. Paul presumes some form of practice where he condemns it. It is clear because most of the sins he enumerates are defined by action. do you seriously think that an alcoholic who abstains from drink is sinning nevertheless?
Even thinking about it is a sin in God's eyes.
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The old 'Can't keep a bird from flying over--but can from building a nest in one's hair' comes to mind.
A homosexual or playboy heterosexual for that matter, can have the enemy seed the thought--
Hey--isn't that a great looking body--wouldn't it feel REALLY GOOD TO . . .
and respond with: AWAY FROM ME SATAN, IN THE NAME OF JESUS.
Taking each thought captive with the aid of Scripture and Spirit when confronted with a homosexual thought
would NOT be sin, imho.