This article is an excerpt from our Sefer
4. The effects of intimacy on the upper and lower worlds:
A. What transpires in heaven during marital intimacy that takes place with holiness:
Intimacy below causes unity above:[1] When intimacy is done in a proper and holy manner it arouses the holiness above and the Divine unification in the Sefiros.
Intimacy draws down G-dly energy from Malchus:[2] The act of intimacy draws down G-dly energy and souls from above. This applies even if one does not sanctify himself during intimacy, just as food gives energy even if one eats it without a blessing. All intimacy of masculine and feminine aspects draws down the infinite light of G-d irrelevant as to where it takes place.[3]
B. What transpires below when marital intimacy takes place with holiness : [4]
When intimacy is performed through sanctification and holiness, the Shechina dwells upon the couple’s union [similar to how the Shechina dwelled on the Keruvim[5]].
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[1] Sh’lah Hakadosh Sha’ar Ha’osyos Erech Kedusha 400
[2] Torah Or Chayeh Sara 16b; Derech Mitzvosecha Peru Urevu p. 3a; See Ramban in Igeres Hakodesh 5
[3] Derech Mitzvosecha ibid
[4] Rebbe Akiva in Sotah 17a; Ramban in Igros Hakodesh 2; Siddur Ya’avetz Mosach Hashabbos Mitos Kesef 3:2; Ma’amarei Admur Ha’emtzai Shemos 1:5; See Reishis Chochma 16:2; Zohar Kedoshim p. 81a; Sheyikadesh Atzmo [Nachmanson-2015] 14:2
[5] Igeres Hakodesh of the Ramban Chapter 2