Romans 1:24-29 for the ‘ladies’.
Onan was not about masturbation; but failing to fulfill a REQUIREMENT.
Genesis 38:8-10
Then Judah said to Onan, “Sleep with your brother’s wife and fulfill your duty to her as a brother-in-law to raise up offspring for your.
What's the difference, Elsie? We already fully know that masturbation fulfills no requirement beyond temporary, immediate sexual pleasure — certainly it does not have any further purpose at all.