To be sure, it is clear from Scripture that illicit sexual fantasies are forbidden, and this is a significant issue with masturbation.
Matt 5:28-29 (NIV) [Jesus:] "But I tell you that anyone who looks at a woman lustfully has already committed adultery with her in his heart. If your right eye causes you to sin, gouge it out and throw it away. It is better for you to lose one part of your body than for your whole body to be thrown into hell."
But what if no illicit fantasies are included in masturbation? Is the act then sinful? By scripture, there is nothing to indicate that it is. Specifically, if the act is done merely as a hedge against temptation and as the body requires then there is no need for the above sinful "crutches". This is hardly exciting, and a rote act of keeping the body in submission. It cannot be done often, as the body is not that demanding if left alone by a perverted imagination. On the other hand, if we attempt a pent-up self-sex life, then we find that the body needs help from the soul through illicit fantasies, and then sin is clearly being committed.
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