First, having sex of any kind in public is socially unacceptable and illegal -whether alone or with someone else, married or unmarried.
Yes, but if sex is done in a way that is pleasing to God it can be announced in public (i.e. women becoming pregnant), and people rejoice alongside you. The same cannot be said for masturbation, or any other form of sexual relationship.
Second, I know what you've gone through in this respect is not uncommon for Christians but I think you still have much to learn, young jedi, so please let me give you some very important advice: condemning yourself for something does not free you from it, it only enslaves you to it. Accepting God's grace is what frees us, so that whether you do or don't you are always under the grace of God. You should be trusting in Christ's atonement for your sins, big or small -or even not sins at all.
That, if I may be honest, at least from the words alone, makes me think that no, you do not know what I've gone through in this respect. I condemn myself to nothing anymore. I used to try to stop myself from the act, but I was weak, and I couldn't do it. But when I humbled myself before God, I was able to break the habit. That, I stress, was only possible because of God's grace. Today, I do not trust Christ only for His atonement for my sins, but His continual guidance so that I stay away from sin.
Your comments, if I may be honest in a loving and slightly chiding manner, is akin to telling an alcoholic, "yes, alcohol is fine if you drink in moderation". Do you think the alcholic doesn't know moderation is the key? We all know that drinking alcohol is perfectly fine, but saying that to an alcoholic can not only be unhelpful, be misleading and disastrous.
Third, let those who proclaim publicly that it is a sin provide solid biblical evidence that it is. If not they should keep silent until they find it.
Again, I plead, and I mean plead:
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We know that we all possess knowledge. Knowledge puffs up, but love builds up." 1 Cor 8:1
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Be careful, however, that the exercise of your freedom does not become a stumbling block to the weak. For if anyone with a weak conscience sees you who have this knowledge eating in an idol's temple, won't he be emboldened to eat what has been sacrificed to idols? So this weak brother, for whom Christ died, is destroyed by your knowledge. When you sin against your brothers in this way and wound their weak conscience, you sin against Christ. Therefore, if what I eat causes my brother to fall into sin, I will never eat meat again, so that I will not cause him to fall." -- 1 Cor. 8:9-13
Please, I pray, seek love, and a humble understanding of your Brothers' weaknesses, and do not become their stumbling blocks. Eating food sacrificed to idols is not a sin in itself, says Paul. But for the sake of his Brothers he refuses to eat them--not because eating itself is a sin, but causing Brothers to fall is a sin.
But, be careful not to associate pleaure or pleasureable things with sin. When that kind of thinking gets into your mind life becomes its own version of hell and really has no meaning.
Yes, but there are certain pleasures that make people more open to falling. Our responsibility as Brothers is to watch out that others do not fall to sin because of their pleasures, and that our actions do not encourage others to sin.