Romans 14:14, "I know, and am persuaded by the Lord Jesus, that there is nothing unclean of itself: but to him that esteemeth any thing to be unclean, to him it is unclean."
Masturbation is not a sin in itself. You can masturbate all you want. God already has a build in limit. If i told you to masturbate all day every day you would discover your limit.
God designed sexuality and said it was very good. Don't let tell you different. Masturbation is very good and very health and a wonderful Gift of God to enjoy.
Sexual lust is God designed and is not evil. Evil lust is evil. Christians are under one law only, the law of love. The whole law is fulfilled in one law the law of love. As long as masturbation does not go against the law of love then it is not a sin.
Most every Bible verse they use against masturbation is taken totally out of context and misused. They don't know the proper context and they don't know the Bible. Most have not even read the whole Bible from beginning to end. They misunderstand lust, fornication, adultery, and the context of the Bible. They were taught wrong definitions on terms and don't take the time to study the context and instead of assuming sex in God's design and is very good they assume sex is evil. They got there teach from the gnostic that said the body is evil. That is false and wrong. God made the Body and sexuality and said it was very good. Only the "sin principal" part is bad.
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God designed sexuality and said it was very good.