The sin of Onan was not the act itself it was not fulfilling his duty to his brothers widow. You can look to the teaches of Jesus and adultery of the heart if you want to condemn that particular act.
Never did I say men are happy to be impotent I merely said they can understand marraige means more than just sex. I would hope my future wife would still be happy and love me if I became injured and could no longer perform physically. But I guess people are just selfish and only after pleasures of the flesh.
What did Saint Paul teach the Corinthians on this point? Do you even know?
Also can the wife of an impotent man demand a divorce?
Of course not.
The sin of Onan was not the act itself it was not fulfilling his duty to his brothers widow.
Onan's sin was against the very nature of the God-given sexual faculty. The disrespect for levirate marriage was also a sin, but one which the Scripture explicitly says is not a capital offense.
You can look to the teaches of Jesus and adultery of the heart if you want to condemn that particular act.
Onan's sin was not one of actual or contemplated adultery.