PilgrimToChrist
Well-Known Member
Onan deliberately prevented himself from creating new life in his act.
This is a far cry from a married couple using a condom when the wife is sterile.
Jim
Summa Contra Gentiles said:[E]very emission of sperm, in such a way that generation cannot follow, is contrary to the good for man. And if this be done deliberately, it must be a sin. Now, I am speaking of a way from which, in itself, generation could not result: such would be any emission of sperm apart from the natural union of male and female. For which reason, sins of this type are called contrary to nature. But, if by accident generation cannot result from the emission of sperm, then this is not a reason for it being against nature, or a sin; as for instance, if the woman happens to be sterile.
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