If not, then the mother who drowned her 5 children has a case. We are still responsible for our actions - drunk, drug-hazed, hormonally-challenged

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Here's some more info for those who might be struggling:
"While I certainly don’t want to contradict what your parents or your pastor believe, I’d like you to consider this:
It is the hidden fears, desires and temptations that cause us the most problems. As tough as this sounds, open up and discuss this struggle with a trusted adult—preferably your dad.
Masturbation is harmful if it’s done . . .
• while fantasizing about an immoral relationship (see Matthew 5:27-28).
• with pornography or any other "unclean picture" set before your eyes.
• to the point of becoming an uncontrollable habit. What’s uncontrollable? A general guide is several times a day every day, for months in a row. If that’s you, talk with someone.
If you don’t struggle with masturbation, great. There’s nothing wrong with you either. But if you do, don’t lose sleep over it and certainly don’t let guilt drive you away from God. Just be sure to avoid the danger zones.
Let me conclude with some excellent advice from Dr. Dobson (taken from his book, Preparing for Adolescence):"It is my opinion that masturbation is not much of an issues with God. It’s a normal part of adolescence, which involves no one else. It does not cause disease, it does not produce babies, and Jesus did not mention it in the Bible. I’m not telling you to masturbate, and I hope you won’t feel the need for it. The best thing I can do is suggest that you talk to God personally about this matter and decide what He wants you to do."
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http://www.family.org/teenguys/breakmag/departments/a0021191.html )
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Before we go further, I need to make the point that it’s easy to confuse normal sexual desire and conduct with addictive compulsions and gratification. A person can have a stronger-than-normal sexual appetite and not be a sex addict.
Addictive sex is done in isolation and is devoid of relationship. This doesn’t necessarily mean that it’s done while physically alone. Rather it means that mentally and emotionally the addict is detached, or isolated, from human relationship and contact. Addictive sex is “mere sex,” sex for its own sake, sex divorced from authentic interaction of persons. This is most clear regarding fantasy, pornography and masturbation. But even regarding sex involving a partner, the partner isn’t really a “person” but a cipher, an interchangeable part in an impersonal — almost mechanical — process. The most intimately personal of human behaviors becomes utterly impersonal.
Addictive sex is secretive. In effect, sex addicts develop a double life, practicing masturbation, going to porn shops and massage parlors, all the while hiding what they’re doing from others — and in a sense, even from themselves.
Addictive sex is devoid of intimacy. Sex addicts are utterly self-focused. They cannot achieve genuine intimacy because their self-obsession leaves no room for giving to others.
Addictive sex is victimizing The overwhelming obsession with self-gratification blinds sex addicts to the harmful effects their behavior is having on others and on themselves.
Addictive sex ends in despair. When married couples make love, they’re more fulfilled for having had the experience. Addictive sex leaves the participants feeling guilty, regretting the experience. Rather than fulfilling them, it leaves them feeling more empty.
Addictive sex is used to escape pain and problems. The escapist nature of addictive sex is often one of the clearest indicators that it is present.
Like any addiction, sex addiction is progressive. It’s like “athlete’s foot of the mind,” as one person described it. It never goes away. It’s always asking to be scratched, promising relief. To scratch, however, is to cause pain and to intensify the itch.
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http://www.family.org/married/romance/a0018669.cfm )
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You wanted to know if masturbation is a sin. To be honest, the Bible seems to be silent on this issue. However, most Christians who believe that masturbation is a sin quote what the Bible says about purity and lust. And I have to say, they do have a point. After all, masturbation is usually accompanied by sexual fantasies. I don’t think there’s anything necessarily wrong with thinking about sex, but I do think a person’s sexual imagination has to be controlled. Most people who masturbate harbor fantasies that are plainly immoral. These should have no place in a Christian’s life.
Why is masturbation unmentioned in the Bible? I can only conclude that it is much less significant to God than it is to most of us. A lot of young Christians — especially boys — would put masturbation as the most significant battle line in their attempt to live as Christians. God does not, apparently, consider it even worth mentioning.
So, here’s my advice on this issue: Don’t think of yourself as weird for having a desire to masturbate. Many other Christian guys struggle with this too. And don’t harbor a bunch of guilt. Instead, talk to God about it. Honestly, God understands what you are going through. Tell Him how you feel, and ask Him for the strength to be self-controlled sexually. Ask God to help you steer clear of lust and immoral sexual fantasies.
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http://www.family.org/pplace/youandteens/a0020173.cfm )
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Finally, brothers, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable--if anything is excellent or praiseworthy--think about such things.