The polygamists say that the LORD Jesus Christ also condoned serial adultery...
Paraphrased, it would be "you shall not adulterate marriage in any form for it is Holy".
Modern man is hell bent on adulterating marriage until it is unrecognizable. Bestiality, sex with the dead, sex with children is not far away as much as the media would say not. It is only a logical progression.
The only cure is repentance, both as a society and individually and the repentance will have to be, ultimately, in the form of action which men fear to take.