You are right that the problem is that Onan used his brother's wife for his own pleasure and also distorted to act itself (deliberately excluding procreation).
Masturbation is basically a person using him/herself for pleasure. God created sex for us to give love to our spouses. Eph 5 describes how husbands must love their wives as Christ loves the Church. Well, Christ gave His whole Self for us on the Cross. So to imitate this love in marriage and sex, we must be giving our whole selves to our spouse. This is a beautiful gift of God, to love as He loves. In masturbation a person does not give him/herself away totally to a spouse, but rather turns in on him/herself. Using him/herself and distorting the act. Exactly what Onan was killed for.
One reason that masturbation is not spelled out in the Bible in a way that many people would like, is because the people who were reading the Bible as it was written were not reading it in isolation. The word fornication is in there a fair bit, but there is no clear definition of what constitutes fornication. This is because, if someone is unsure about what is fornication they are meant to turn to a leader in their church (maybe a priest, or a bishop) to ask. And at the same time as people would read or hear the Bible, they would hear preaching from the Church. We can see that this was the intended model from 1Tim 3. Oral preaching and Holy Tradition was the norm, the Scriptures (esp the New Testament) were a supplement to that.
So the bible spells out all the things that are considered sexually immoral but leaves out the most common one? The logical deduction from that is that masturbation is not wrong.
Maybe God doesn't think of it as sex.
You mention giving our whole selves to our spouse and that masturbation ruins that. How? First off, I'm not married, so how would that apply to me? Second off, what about the cases where masturbation has increased the joy of sex for married couples?
If you are wondering what I am talking about, see this quote from someone posting in the theology of the body forum:
Doolin:
I have had troubles like Buddygirl described and can give some perspective from the man's side. I have been married for 15 years and always used NFP and we were even NFP teachers for some time. I always suffered from the same "finishing too early". My wife is not shy and let me know she wasn't too pleased with the situation. This went on for man years and she insisted I do something, go to the doctor, anything.
I maintained that I didn't have a problem, it is just a simple matter of frequency. With NFP and a growing family and busy life the frequency of intercourse is 1-2 times a month and at this is the root cause of my trouble. Of course she didn't like my proposed solution which was to increase the frequency.
Now with 5 kids and a 10 month old baby her desire is very low and the frequency of sex is even lower. If we do attempt it I suffer even worse from short duration and she is de-motivated to try even more.
After doing this for about 6 months I fell prey to the sin of touching yourself. It just so happened that she had some interest on the same day I sinned and my duration was very long - she was shocked and we had one of the greatest experiences of our married life.
Now I'm completely stuck. I know the Church teaching and that I sinned. I also know that if I do nothing and just have intercourse once every few months she will be greatly disappointed and let me know it and try to send me to the doctor.
I sometimes wonder why God made me like this - if I follow his plan it seems to lead to a result that is disappointing for both of us.
So the logical thing would be for them to simply have sex more often! But his wife isn't going to be able to turn on her hormones like a light switch.
There are several solutions to the problem that don't involve sin. (Mostly relating to making the act more enjoyable for the woman so that she literally wants to more.) But some people just don't care to do that sort of thing, even when one spouse suggests it.
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