(1) On Marriage and 1-1:
Marriage is not necessarily a one to one relationship. It can be a one to many relationship or a many to many relationship. Christ said only that marriage was permanent, but never that it was exclusively 1 to 1.
(2) We are not animals:
IIRC it was your argument that we are male and female and thus monogamous. I merely used the examples of non human male and female to demonstrate that maleness and femaleness does not imply monogamy as you contend. That is all.
(3) Jews did not practice divorce.
I was not addressing divorce. I was addressing polygamy (and polyandry). Two different things. You brought up divorce, not me. You are confused because you think of marriage as exclusively a 1-1 relationship. See response to (1).
Then "adultery" is the wrong word for the guilt of marrying another. Adultery, by definition, is intercourse with someone else's husband or wife. If you marry someone else, regardless if you put another wife away improperly, it could not be adultery.
IIRC it was your argument that we are male and female and thus monogamous.
Not just that we are made "male and female," but that Adam was given only one woman, Eve. It is with this same logic that Christ condemns divorce.
I was not addressing divorce. I was addressing polygamy (and polyandry).
You stated that polygamy was not condemned in the Old Testament. Thus I replied, neither was divorce. It is here condemned by Christ.