I do repent of my sexual fantasies towards teenage boys and my feeding of my fleshly nature with pornography. I ask Jesus to forgive my sins and to wash me in His blood. I submit to God and resist the devil. I go to the cross with my sinful nature and ask Jesus to create a new man.
Everything is fine for a few days and then the cycle begins again - I am not free yet but I desire to be clean and sanctified by the Holy Spirit.
I agree with you that there is no mention of masturbation in the Bible.
I want to grow spiritually and be more like Jesus but so often lustful fantasies overwhelm me for several days and I become depressed and discouraged.
Jesus help me to overcome through the power of your Spirit in me!