Abraham claimed he was God's best buddy...and God spoke to him personally. He had multiple sexual partners..ditto for David, and many other "faithful" friends of God
This is a good point. Very CLEARLY God had no issue with this. Do the Greek scriptures new testament ever explain why eventually it should just be one wife/one woman only? Or did customs just change?
In the San Francisco area we had some bisexual/gay JWs men in the 60s whose wives WTB&Ts said were not free to divorce and then remarry. Why? Because Watchtower said adultery required vaginal intercourse with a woman...anal and oral intercourse did not constitute adultery!!!
This left me speechless.... however, this also confirms that the concept of porneia is, unsurprisingly, open to interpretation.