Ooh..sorry. I missed that.
Well, I would argue that the sexual desire is natural, but that masturbation is an unnatural corruption of it.
Why? On what do you base such an argument?
What makes it fine? Don't say because it's natural

haha
Haha, no, not only because of that. It's fine because it is healthy, harms no one, and has not been declared sinful. I've never once seen an argument for masturbation being sinful that didn't hinge on someone being raised a certain way, or having a faulty interpretation of scripture. Many times such a view is bolstered by the desire to appear righteous.
Fair enough, but that just proves sex, not masturbation.
No, I'm saying that just because you're only familiar with one purpose for something doesn't mean that other purposes do not exist, and does not mean that those other purposes are somehow wrong. The Bible says nothing on it, and I cannot imagine the God I love condemning something as harmless and healthy as masturbation. God has
such bigger fish to fry.
Well..I wasn't raised in a Christian home.. but "marriage" began with Adam and Eve, and that's in the Bible.
I'm not saying that marriage is bad or anything. That would be silly. But prior to marriage there is nothing wrong with relieving and enjoying oneself. It does not ruin one's purity or anything like that. In fact, it's
very helpful for learning what you respond to. There's nothing more disheartening than finally getting to the point where you're ready to share your virginity with someone and neither of you knowing what you need to enjoy yourselves.
I don't know about it being healthy (it can become addictive, I guess, that's not very healthy..)
All major professional medical and psychiatric organizations consider it healthy and normal. It relieves stress and sexual frustration and has even shown to be beneficial in dealing with certain forms of male cancer. As for it being addictive,
anything can be addictive. Food can be addictive. Internet use can be addictive. People make the mistake of attributing non-chemical addiction to an activity rather than the person. An addiction-prone personality is usually to blame in cases like this, and you will often find that even if a certain activity is stopped, that person will simply move onto the next addiction. Addiction-prone personalities are something that can be treated.
...Normal? That's based on what the majority thinks, and we live in a fallen world.
Sure, we do, but I don't think that in this case it's a symptom of our fallen nature. I haven't seen any reason to believe that.
And..'doesn't harm anyone', well that doesn't mean it's not a sin!
No, you're right, but things that
do harm others unduly
are sins. I'm just ruling out all the conditions that could make it sinful. The big ones are: do you feel personally convicted by it? (I do not.) Is it shown to be sinful by a thoughtful, proper understanding of scriptural morality? (It is not.) Does it violate the ethic of reciprocity (the "Golden Rule")? (It doesn't.)
What's the purpose of sexual activity?
I consider it to have a number of purposes. Procreation, of course, is its primary biological purpose. Pleasure, however, is certainly also one of the purposes of sexual activity. And secondary purposes are not bad things unless they're actually bad. For instance, the primary purpose of the vocal cords is to facilitate speech. But we also use our vocal cords to sing, and singing is a wonderful gift.
I imagine it's to have children. And for intimacy between two people...two people, not one.
Both of those are purposes of sexual activity, but I disagree with "not one" part. I see no reason to believe that enjoying it by yourself is somehow immoral.
My question is, why do you believe it's not a sin?
I believe it is not a sin for the same reason I believe that using a computer is not a sin. It's not covered in the Bible or by anything we know of Christ's morality, and I do not feel personally convicted by it in any way. If you
do feel personally convicted by it, it's probably a good idea to avoid it. But do try to ask yourself if that conviction comes from your own personal leanings against it or from God.
It's something witnessed in nature, in young children and by all cultures. It is as normal as scratching an itch.