You have been careful not to be graphic. Bless you! You share an issue that affects countless - either directly or indirectly. This is important for us all!
Sins all have the same root. When the root dies, then there can be victory over many sins. This is the hope of the Gospel!
While we are living in the flesh, it is pointless to try to catagorize varying degrees of sin, and then try to justify ourselves by taking the path of “lesser evil”. This is a common problem among all who are still in the “trying” mode. We are still trying to justify ourselves. That is our core rebellion against the Lord.
THink about eating: It is also God-given survival instinct that easily goes overboard. They say that diets never work. Why? Well, the more you try to stop eating what you shouldn’t the more you think about food; and then the more you think about it, the more you want it. In other words, trying hard to stop sometimes has a reverse effect. You set your mind up for temptations.
The entire Bible is much about victory over sin. Thus, there is no lack of help from there. It points to the source of hope: Christ himself. However, we will receive his help only when we are willing to recognize our utter inability to free ourselves from sin. We are spiritually bankrupt.
From your post, sir, I'm not convinced that you have come to that point yet. Certainly your youth leader has not! He is like the blind leading the blind.
The big question regarding any struggle with sin is this: Do I want to continue being a self-justified, self-focused person, a clean "empty cup" or do I want Christ to fill my life with himself and let his love radiate to the world around me though me.
Your answer will determine what course your life takes.
"Rather, clothe yourselves with the Lord Jesus Christ, and do not think about how to gratify the desires of the sinful nature." Romans 13:14
“So I say, walk by the Spirit, and you will not gratify the desires of the sinful nature.” Gal. 5:16