My side: I believe in the gifts of the Holy Spirit , in Bible (solo), that it's possible to have deep experiences nowadays with God as Ezekiel, Jeremiah and Paul did by fasting and seeking souls, and if you to die in sin you'll lose your salvation, they usually call this in my country as Pentecostalism.
This post (What is the biblical basis to claim that masturbation is a sin?) doesn't have answers that answers me, their answers are either about adultery in heart, that masturbation is not sin by itself but the impure thinking is, onan based (which is a very poor argument) and rational arguments (see below).
First of all, I'm not wondering with myself if it's a sin or not (I will not go with answers that doesn't consider it as a sin by itself), but when I'm being tempted some questions comes up and I fall in sin because the little doubt space if it's a sin, I'd like to know a straightforward answer that proves it's a sin (although I know it's a sin) without rational arguments, by that I mean some stuff like: "you get sad masturbating", "this brings you closer to pornography", "this pollutes your mind", summarizing it all it means "arguments that are based in empiricism, subjectivism, abuse of logic..."
Another argument which I will not go with is "you are commenting adultery in your mind" because it's not from what a masturbation is by own but just a consequence, I know the Bible doesn't state about that very clear... but I'm hopefully in to find out a raw argument, I was studying about that, those bellow are the best arguments that I find out but I'd like to find something stronger:
- In my language, fornication is any sexual act from marriage outside but in English dictionary is to have sex with another one without being married to each other so from Portuguese dictionary masturbation is easily a sin but on English one not.
- Masturbation can be seen as an immoral sexuality but some Bible translate this as fornication and there is no formal definition for sexual immorality.
- The strongest one is Jude 1:7: "7 as Sodom and Gomorrah, and the cities around them in a similar manner to these, having given themselves over to sexual immorality and gone after strange flesh, are set forth as an example, suffering the vengeance of eternal fire.", I'm not sure what "gone after strange flesh" really means but in my Portuguese Bible it means "non natural sexual relationship" since a natural relationship from the bible seems to mean "sex in marriage" is easier to go masturbation as sin but I'm not satisfied with the such argument because the Bible doesn't say "a natural sexual relation is...."
PS: I'm not accepting rational arguments because by rational arguments so many things don't make sense in bible, example why is "OK" pay within an eternity for something you done in your finite life? by logic the bible has some contradictions and so on...