“וַיֶּעְתַּר יִצְחָק לַיהוָה לְנֹכַח אִשְׁתּוֹ כִּי עֲקָרָה הִוא וַיֵּעָתֶר לוֹ יְהוָה וַתַּהַר רִבְקָה אִשְׁתּוֹ”
“And Isaac prayed to YHVH for his wife, because she was barren. And YHVH granted his prayer, and Rebekah his wife conceived.”
Rabbi Yaakov bar Acha explains that Rebekah was barren because when the evil inclination is not in the world to drives the desires of men then there’s no ‘fruitfulness’. Through prayers we can draw this force as it says immediately after Isaac prayer, ‘And YHVH granted his prayer’.
Rabbi Yosei asks about the difference between his time (present time) and the time of Isaac. Rabbi Acha explains that God awakened his desire for unification, not like in this time that the desire exists in people all the time and cause them to sin.
“וְנָתַתִּי לָכֶם לֵב חָדָשׁ וְרוּחַ חֲדָשָׁה אֶתֵּן בְּקִרְבְּכֶם וַהֲסִרֹתִי אֶת לֵב הָאֶבֶן מִבְּשַׂרְכֶם וְנָתַתִּי לָכֶם לֵב בָּשָׂר”
“And I will give you a new heart, and a new spirit I will put within you. And I will remove the heart of stone from your flesh and give you a heart of flesh.”
I the future God will remove the impure desires for the ‘flesh’ and will ‘install’ a heart of flesh. Rabbi Yehuda explains that ‘heart of flesh’ is the pure desire that the Holy One Blessed be he will awaken in us to bring out ‘flesh’ that is the aspect of having children.
After the correction of the world, the pleasures of sex would be on a lower level. The pleasure of feeling the presence of the Light of God in everything would be beyond our imagination. We will be like “dreamers” (Psalms 126). God will raise the desire to have sex for procreation so we can have children.
The pleasure of sex that a man experience in this world is generated by transforming 100% spiritual energy that is life force from Chokmah and Binah (two main parts of the brain). This life force flows down through the spinal cord to the testicles that produce the ‘matter’ from the ‘upper’ energy. The pleasure that comes from the source (Chokmah and Binah) is experienced when it is manifested and transferred to the vessel. The woman enjoys the process when the channel of light penetrates the vessel and prepare it for the light. When the vessel is completely ready, the woman reaches the peak of pleasure, welcoming the Light.
Self generated pleasure is fake and in most cases leaves the man or woman in hunger for more. This kind of pleasure drives a person to unbalanced desires because the ‘wasted’ light is captured by the negative-side.
The pleasure of the light from Binah goes down 8 levels (from Binah to Malchut) and reduced on each level. The spiritual energy gets ‘condensed’ on the way down until it becomes matter. In the Garden of Eden and after the Final Redemption we will experience this light directly and gives us endless pleasure. For that reason God will need to ‘remind’ us to have sex and produce ‘flesh’.