It's not a sin. Joy is our birth-right, just ask any autonomous nervous system.

Sin, as defined by whom? If it feels wrong and it hurts someone...don't. However, if it feels good, and it harms no one...by all means.

When I was a child, my religiously zealous father asked me if I did that and made a point to remind me that it was a sin.

I think Puritanical religion back in the day began the idea that any kind of sexual desire was sinful, especially for women.

Because centuries ago the belief that semen was microscopic tiny babies was dictated to the population by those who knew/know nothing. That would mean millions of dead babies going to waste when plague, pestilence, war, starvation permitted most to perish at 30 years old. Of course we women would never engage in such deviant behavior.

Puts on his God goggles

Masturbation is a sin because it is using sexual stimulation for something beyond procreation. We are supposed to "be fruitful and multiply" not "spill our seed on the ground."

removes goggles

Sin doesn't exist so go forth and rub one out. Or go first and rub four out for all I care. What you do to your own genitalia is your own business. Just, for your own sake, do it in private conditions.

As it seems, every pleasure is a sin. I think we better to be happy and go to hell.

The idea of masturbation as a "sin" comes from the narrative of Onan in the book of Genesis. That same story is also the source of the prohibition against birth control in the Catholic church. God killed Onan because he "spilled his seed on the ground" rather than impregnate his brother's wife in accordance with some ancient pre-Moses law.

I never heard a religious person say that until I went to USA. Just seems completely bananas to me.

Because religious people are seriously dysfunctional!!!

No sin, because there's no god to sin against. Fini.

Since sin is best defined as separation from god, there can be no sin if there is no god.

But Wait! You are demanding a bunch of Atheists and Agnostics answer stupid questions about things in a stupid book?
Read the room well, do ya?

A biblical means of increasing one's own tribe ( and power) "Let all your seed go to making more young people to be fighters, carers and servants".

Each ' sin ' needs explaining in a different way, but all are about control.

The Bible is a book written by men to control the masses. Since the very first book it was shown that any sort of pleasure is wrong; however, since the Bible has so many inconsistencies and authors, a person can take any verses and make it be sinful.
In my experience, Christians say verses like Galatians 5:16, 1 Thessalonians 4:3-5, 1 Peter 2:11, and the famous verse Matthew 5:30 (if your hand causes you to sin, cut it off). But then you have books like songs of Solomon which is like a bible version of fifty shades of grey and talks about sex and pleasure being a gift from god.
So with so many interpretations, verses, books, and authors you can make so many interpretations. Some interpretations say it’s sinful and wrong and some say it’s fine in moderation. So it depends

Probably one source is when god killed a guy for cumming on the floor instead of into his dead brother's widow because the kid would have been considered his brother's.

This idea is for mind controlled people. A possibility of control over a large segment of the population.

Shame, shame, shame.

In the Bible a woman is only one of two things: A virgin or an evil whore. Which is Bull!@#$

Religious people usually talk the most sh×t. Yet, it is they who get caught doing the sickest sh×t ever, like with child pornography, the men get caught in hotel rooms with underage boys, they cheat on their spouses, pay hookers for sex, etc.

They can't tell me what to do with my body!

I can resist anything but temptation.

Religion is a control system just like government. Both were designed by power hungry people to con people into following rules they instituted. Religion uses God to scare people into following their rules with the threat of damnation in the afterlife for disobedience. Government uses police/courts to inflict damage onto those who do not agree with said rules of society which they installed without our personal consent. So the real question that needs to be asked...just who told you that you were a sinner or an outlaw? If you do not cause harm to another...why is something immoral or illegal?

You can make almost anything a sin by bending and stretching the various translations of the bible. Its a sin as it opposes the Catholic churches need for fodder in the middle ages. From there it morphed into the overarching Christians obsession with non guilty pleasures being evil. Their is a logic to most things defined as sin. Almost all are about control. Large scale religions gained secular power through control, most often of woman for the benefit of men. Look at the modern Quiverfull movement. Their God is simply a Trojan horse for their obsession with control and their faithfuls wish to either take advantage of that control, have no real say as they are born into it, or find its structure the only way for them to deal with their lives. People talk about context and the bible and it makes me laugh as outside of historical relevance context all depends on what one wants from the good book. Its a myth used as a tool for control of reality. So saying this is what it meant has as much relevance as I saying THIS is what it meant. It means what you want it too or not that is the essence of religion and dogma. Arguing it from a reasoned POV is folly. I stopped long ago trying to argue what the Bible means.

Historically you find religions that are concerned about the number of believers are the strongest against masturbation. Those seed better be fertilizing someone's garden. It also follows from an ancient belief that men had only so many sperm and that masturbation 'wasted' them -- as did homosexuality. So at least in the US there were insane attempts to prevent masturbation in the 19th century. Beds were made for boys with shackles on the sides to keep their hands away from their bodies. Devices that were very much like chastity belts were put on young girls for the same purpose. There were camps where people were exhausted physically based on the belief that healthy people would lose their interest in sex (although now we know the reverse to be true). Graham crackers and corn flakes were invented to provide a 'healthy diet' again so that the urge for masturbation would go away. And into the 20th century kids were told that if they masturbated they would: die, go insane, or grow hair on the palms of their hands. How frightened do you have to be of a behavior to invent the lie that it would kill you???

Sin or not, it clearly doesn't matter to people in here. Remember what app is this, right? ?

Those religous idiots consider a lot of thing to be sin. I don’t really pay much attention to them anyway as they are delusional. I have a very religous friend who considers cursing and watching porn to be very sinful but has been married 5 times to 5 different women. Go figure.