The flesh has enmity with the spirit....
We are tempted thru the desires of our flesh as Paul stated. So if one successfully resists temptation, though he had desire than one has not sinned. Paul had his “thorn in the flesh” that Christ had not taken away from him, instead receiving the answer of “My grace is sufficient for thee”.
If simply having desire(whether for illicit sex, money, power, ungodly fame, ect) was evidence of sin, then all Christians everywhere are in terrible trouble!
However, Jesus did say that if one looked upon a woman with lust, then he has already committed adultery in his heart, so maybe this would also include homosexuals lusting after others, but not giving in to the temptation. Having said that, I seriously doubt that any of them DON’T give into the temptation.
King James Bible
But I say unto you, That whosoever looketh on a woman to lust after her hath committed adultery with her already in his heart.
Remember the Jimmy Carter Playboy interview where he admitted he committed adultery in his heart?
Everyone sins. Paul laments that he does the things he shouldn’t and doesn’t do what he should. Jesus said that having lust in the heart or anger at a brother is sin.
We all fight our sinful natures as long as we live, but the key is fighting it. It’s not enough to say, “That’s just the way I am.” if being that way is an affront to God.