But when a woman is pregnant or nursing, she cannot conceive, and you are suggesting that married couples should therefore only have sex once every two or so years, and anything else would be selfish and rebellious. If that were so, the Bible would say as much. Exodus 20 - the end of Leviticus is a solid chunk of rules and laws, many of which are very minor. If something like what you are suggesting were true it would be listed among those verses. God does not simply gloss over things that important, He tells us, and then tells us again what to do and what not to do. It simply is not in the Bible. If you want to live as a monk or be celibate, that is your choice, and Paul made that choice, but please do not tell people it is sinful to do otherwise because that is a misrepresentation of the Word of God. He designed us they way we are for a reason. If He wanted us to have sex only for procreation, He could have simply made it impossible to do otherwise, or non pleasurable anyways. The intimacy it builds between a married couple and the strength it can add to a godly marriage demonstrates intercourse apart from procreation is good. And again, you cannot simply declare it sinful, the Bible must declare it sinful. And it does not.
So using your logic of "if it's not explicitly stated in the Bible it doesn't exist" such as masturbation, Where did Cain get his wife from?
Leviticus 15
16 And if any man's seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even.
17 And every garment, and every skin, whereon is the seed of copulation, shall be washed with water, and be unclean until the even.
18 The woman also with whom man shall lie with seed of copulation, they shall both bathe themselves in water, and be unclean until the even.
Now what would "unclean" mean?
Galatians 5
19 Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness,
20 Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies,
21 Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before , as I have also told you in time past , that they which do such things shall not inherit the kingdom of God.
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I don't think this can be argued any further.
Masturbation is a sin.
That doesn't go without saying that your sins are forgiven by God's grace through Jesus Christ.