(the following is for mature adults only, which, of course, may be an oxymoron)
As we know (the quotation is a bit long, but be patient)
the ten sefirot involved in the creation of the world—described as numbers in the Sefer Yetzirah—become emanations, or qualities, of God. Listed in order of their appearance and with a literal translation of their Hebrew meaning in parentheses, they are Keter (crown), Binah (understanding), Chochmah (wisdom), Gevurah (strength), Chesed (love), Tiferet (beauty), Hod (splendor), Netzach (endurance), Yesod (foundation), and Shekhinah (kingdom). Each sefirah represents many things, including one of God’s qualities, a stage in the creation of the world, a biblical character, and a part of God’s body. Kabbalists portray the ten sefirot on a Tree of Life that serves as a visual map. The location of each sefirah on the Tree of Life represents a variety of qualities, including the sefirah’s gender and position on God’s body.
The first sefirah that emerged from God lies at the top of the Tree. Then, beginning with Keter, each sefirah arose out of and slightly modified the sefirah (or sefirot) that preceded it. Binah came from Keter. Gevurah came from Keter and Binah, altering both of them. The sefirot on the left side of the Tree (Binah, Gevurah, and Hod) are associated with feminine traits, whereas those on the right side (Chochmah, Chesed, and Netzach) are thought to be more masculine. Those in the center column (Keter, Tiferet, Yesod, and Shekhinah) are neutral...The masculine side of the Tree represents pure energy: force, expansion, and expression. The left, or feminine side, represents limitation, restraint, and strength, all of which provide guidance and direction to the energy on the right side. The two sides need each other and thrive off of what each provides the other.
Nothing distinguishes Kabbalah from mainstream Jewish thought more than the sefirot. The underlying implication of the sefirot is that God is composed of many things, but the Torah strictly demands a belief in only one God, a belief known as monotheism...
...Yesod is the ninth sefirah and appears in the middle of the Tree of Life. Yesod has two main roles: it balances out Netzach and Hod, and it channels the energy from the upper sefirot to the final sefirah, Shekhinah. Yesod means “foundation” and is associated with God’s circumcised penis, which unites Tiferet, the son of Binah and Chochmah, with Shekhinah, the final sefirah, which represents the human world. The biblical character associated with Yesod is Joseph, Jacob’s son, who was sold into slavery in Egypt by his brothers and there interpreted the dreams of the Egyptian pharaoh....
...The goal of all kabbalists is to bring about the union of Shekhinah, the feminine representative of God in the human world, and Tiferet, the masculine side of God. Kabbalists believe that righteous action on the part of believers stimulates Yesod (God’s phallus) and hastens the divine union of Shekhinah and Tiferet. Marriage and sexual intercourse among human beings are believed to be symbolic of Shekhinah and Tiferet’s divine union. Shekhinah’s biblical character is David, the second king of the twelve tribes of Israel.
...Whereas many religions shy away from embracing, or even addressing, the sexual side of life, Kabbalah makes the sexual act the source of the religion’s highest aim. In most kabbalistic writing, the longing of Tiferet for Shekhinah (and vice versa) is described explicitly as sexual desire. Their lust for one another is said to stimulate God’s penis, which brings the two together in sexual bliss. Perhaps most surprising is that Kabbalah followers believe that the only way for them to restore the wholeness of God is to stimulate God’s penis by studying Kabbalah and doing good deeds. Another way kabbalists believe they can honor the union of Tiferet and Shekhinah is by getting married and having sex. Kabbalists have long considered Friday night, the beginning of the Sabbath, Shekhinah’s holiest hour and therefore the ideal time for marriages and sex to take place.
And Kabbalah places much emphasis on the spiritual value of circumcision (here)
When the Jewish People do not keep the covenant of circumcision, the nations of the world dominate them. (Tikunei Zohar, Tikun 13)
Well, that being the case, here is Madonna being introduced to Kabbalah study: