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, 13:11, April 11, 2007
Onan was the second son of Judah. Required to impregnate his deceased brother's wife, acording to Genesis 38:10-11 "he went in unto his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother. And the thing which he did displeased the LORD: wherefore he slew him also."
Therefore the sin of Onan was not masturbation, as is commonly supposed, but coitus interruptus.