יְהוָה אֶתְכֶם בְּיָד חֲזָקָה וַיִּפְדְּךָ מִבֵּית עֲבָדִים מִיַּד פַּרְעֹה מֶלֶךְ־מִצְרָיִם

וַיֹּאמֶר יְהוָה

Polygamy

Rabbinic explanation: It can be seen in the Torah and throughout the Hebrew Bible that polygamy is not against the law and can be a blessing. Jewish monogamy originated with the Ashkenazi, who were already monogamous before they converted to Judaism right before the Crusades. Because the Ashkenazi were originally a matriarchal society, when they first converted to Judaism, they were very uncomfortable with Jewish law, especially regarding marriage and sexual relations. That’s why the Ashkenazi Jews later taught that the wife would only “help” the husband if the man was capable. If the husband is not capable, the wife will turn against her husband. The Rema and Rabbeinu Gershom more directly stipulates that only monogamy is allowed, while all polygamists are punished.

(This song talks about polygamy but has nothing to do with Jewish law.)
It’s unclear why Ashkenazi and Taiwanese are Matriarchy. Don’t use meaningless etymology for either Ashkenazi and Taiwanese to counter this fact. Interestingly, matriarchal societies have produced the best warriors throughout human history. Because everything a soldier does has no selfish motives, just to honor his mother and wife. Currently, there are only two capitals in the world, Taipei and Tel Aviv, which have to fight against the malicious intentions of some state actors around the world, both militarily and diplomatically. These two matriarchal societies should fight side by side to fight against the bullying order led by China and Russia and their proxies.

Song of Songs will teach us not only our sexual relations, but also, the way of salvation, and how we fight the good fight for our mothers and wives to honor G-d.

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Deuteronomy 15:22: Eat it in your settlements, the impure among you no less than the pure, just like the gazelle and the deer. 
Song 2:7: I adjure you, O maidens of Jerusalem, By gazelles or by hinds of the field: Do not wake or rouse Love until it please!

I bind you under oath. You, the nations.
By the gazelles and the does. That you will be abandoned and preyed upon like gazelles and does.
That you do not cause hatred nor disturb this love. That is between my beloved and I, to change it or to exchange it and seek that I be lured after you.
While it still pleases. As long as it is ingrained in my heart, and He desires me.
While it still pleases. As in, “While עַד the king was at his table,” [i.e.,] while the king was still at his table.
That you do not cause hatred. If you cause hatred [=עֵר, as in, “and has become your adversary עָרֶךָ,” [and as in,] “And its interpretation upon Your enemies לְעָרָיךְ.”
Nor disturb. As in, “one who contests הָעוֹרֵר the ownership of a field,” chaloner in O.F. There are many Aggadic Midrashim, but they do not match the sequence of the topics, for I see that Shlomo prophesied and spoke about the exodus from Egypt and about the giving of the Torah, and the Tabernacle, the entry into the land [i.e., Eretz Yisroel], and the Beis Hamikdosh, the exile in Bavel, and the coming of the second Beis Hamikdosh and its destruction.