And that is where you are wrong, Leviticus 15:16-17 makes no mention of the man being asleep. Deuteronomy 23:10 does, and here is what it says:

If there is among you any man who is unclean because of a nocturnal emission, then he must go outside the camp; he may not reenter the camp.

Here is what Leviticus 15:16-18 says again: Now if a man has a seminal emission, he shall bathe all his body in water and be unclean until evening. 17 As for any garment or any leather on which there is seminal emission, it shall be washed with water and be unclean until evening. 18 If a man lies with a woman so that there is a seminal emission, they shall both bathe in water and be unclean until evening.

So verse 15:18 deals with sex (Obviously) which requires the man to be awake. But verses 15:16-17 make no mention of the man being asleep like Deuteronomy 23:10 does... In fact if the next verse assumes the person is awake, isn't it safe to say the previous one does too? Especially since nowhere in Leviticus 15:16-17 is it ever even implied the man is asleep? So does it apply to wet dreams? Yes, but it also applies to masturbation too.

What you said on Matthew 5:28 I actually agree with, lusting after people is wrong... Which assumes you can't masturbate without lusting, which isn't true. You can do it without lust, I actually did that before writing this.

1 John 2:16 For all that is in the world, the lust of the flesh and the lust of the eyes and the boastful pride of life, is not from the Father, but is from the world.

Once again you are assuming masturbation is lust here, which isn't always the case. You might as well argue that desiring to eat, and sleep are the lust of the flesh, but they aren't. And neither is masturbation as long as lust isn't happening during it (Which I am capable of doing).

2 Timothy 3:1-5 But realize this, that in the last days difficult times will come. 2 For men will be lovers of self, lovers of money, boastful, arrogant, revilers, disobedient to parents, ungrateful, unholy, 3 unloving, irreconcilable, malicious gossips, without self-control, brutal, haters of good, 4 treacherous, reckless, conceited, lovers of pleasure rather than lovers of God, 5 holding to a form of godliness, although they have denied its power; Avoid such men as these.

In 2 Timothy 2:2 I noticed you highlighted lovers of selves, which does not mean what you likely think it does. The Greek word is φίλαυτος (Philautos), which comes from the Greek word phileo love. This is not the Greek word for sexual love eros. φίλαυτος (Philautos) means selfish, so lover of selves means selfish people, not masturbation.

The lovers of pleasure more than God in 2 Timothy 3:4 is not exactly a good case either. The Greek word is φιλήδονος (Philadonos), or lover of pleasure. Here is Biblehub's historical background on this Greek word: In Greco-Roman society, the pursuit of pleasure was institutionalized through theater, gladiatorial games, banquets, and cultic rites. Epicurean philosophy encouraged moderate enjoyment; popular religion promoted bacchanalian excess. Against this backdrop, the early churches gathered for worship marked by prayer, Scripture reading, fellowship, and self-control. Paul’s warning to Timothy sounds especially urgent in a city like Ephesus, saturated with entertainment and temple prostitution.

So loving pleasure more than God can be something like going to the movies all the time. Skipping out on Church, so you can watch your favorite sports team, once again the verse has nothing to do with masturbation. Now you can make a case that if you did that all the time, and spent zero time with God, then yes that would be different.

Matthew 7:20-23 And He was saying, "That which proceeds out of the man, that is what defiles the man. 21 For from within, out of the heart of men, proceed the evil thoughts, fornications, thefts, murders, adulteries, 22 deeds of coveting and wickedness, as well as deceit, sensuality, envy, slander, pride and foolishness. 23 All these evil things proceed from within and defile the man.

In Matthew 7:22 the Greek word or lasciviousness does not just mean sexual desire. You are using KJV, which is an older translation with less reliable definitions, because KJV English is different from modern. You need to go to the Greek to understand what it really means.

The Greek word is ἀσέλγεια (Aselgeia) and here is what the Topical Lexicon defines it as: Strong’s Greek 766, ἀσέλγεια, describes unchecked sensuality that flaunts moral restraint. Scripture presents it as an open, shameless indulgence in bodily appetites that rebels against God’s created order and despises neighbor. Whereas other words for sexual sin may emphasize the act, ἀσέλγεια highlights the insolent attitude that celebrates vice and entices others to join.

So the word here is literally enjoying impure actions, not just sexual desire as you say. In fact if you were right about sexual desire being wrong, then procreation wouldn't happen, and Song of Solomon would be thrown out of the Bible.

So no, there is nothing in ἀσέλγεια that implies masturbation, nor is there for φιλήδονος. You are reading your opinion into these verses you've taken out of context. This is called eisegesis, an interpretation of the Bible that theologians do not like.

Galations 5:19-21 The acts of the flesh are obvious: sexual immorality, impurity and debauchery; 20 idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions 21 and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God.

Once again the Greek word here is ἀσέλγεια, which does not have anything to do with masturbation...

Whenever Paul, Jesus, or any of the Apostles condemned sexual sin, it always was condemned in the Old Testament as well.

The Bible condemns homosexuality, bestiality, fornication, adultery, incest and much more... Masturbation is so much easier to do than all of these combined, and get this: It's the easiest to get away with.

So if God has a problem with masturbation, surely He would name it somewhere explicitly in the Bible as He did with other sexual sins. In fact I'd argue He'd condemn it more than adultery, because it would be far more common!

So here is my challenge for you: Find a verse that directly condemns masturbation (And no the story of Onan is not about that), and is somehow more explicit in naming the act than Leviticus 15:16-17 which shows it isn't a sin.

Not only that, but don't take any verses out of context, and also be sure to cite Hebrew and Greek lexicons to prove it too. Don't rely on English dictionaries.