Thank you for the link. Below is the original Biblical text, from Genesis 38. Please read it carefully, and see if you can identify the specific sin that is so harshly condemned by God:
6 Now Judah took a wife for Er his firstborn, and her name was Tamar. 7 But Er, Judah’s firstborn, was evil in the sight of the Lord, so the Lord took his life. 8 Then Judah said to Onan, “Go in to your brother’s wife, and perform your duty as a brother-in-law to her, and raise up offspring for your brother.” 9 Onan knew that the offspring would not be his; so when he went in to his brother’s wife, he wasted [or ‘spilled’] his seed on the ground in order not to give offspring to his brother. 10 But what he did was displeasing in the sight of the Lord; so He took his life also.
Post 91 was supposed to be addressed to you. Somehow I pinged myself instead. Anyway, the text is in 91, and we can discuss it from there.