Originally posted by: Zakath15
Exactly.
The whole point about the story of Onan (and subsequently, Onanism) was misconstrued. Masturbation, in itself, isn't inherently sinful. What Onan did wasn't masturbation, per se, it was actually just a method of "pulling out"; he did this out of selfish motivation (knowing the child borne would not be his), and not out of respect for God's command.
Then Judah said to Onan, "Lie with your brother's wife and fulfill your duty to her as a brother-in-law to produce offspring for your brother." 9 But Onan knew that the offspring would not be his; so whenever he lay with his brother's wife, he spilled his semen on the ground to keep from producing offspring for his brother. 10 What he did was wicked in the LORD's sight; so he put him to death also.
However, there are passages that would point to some sort of sinfulness... "Therefore, honor God with your body" (1 Cor. 6:20), "...that each of you should learn to control his body in a way that is holy and honorable." (1 Thess. 4:4) When dealing with pornography or 'lustful thoughts' about women, the issue is fairly clear - that line of thought is wrong, from a Christian perspective. As to masturbation, the compromise I came to in my Christian days was that if masturbation was an issue that caused enough guilt to compromise my "walk with god", then I should attempt to curtail it.